CISO Tribune

Vendor comparison · 2 companies

GreyNoise vs VulnCheck

GreyNoise sells real-time network threat intelligence built on traffic it observes at the network edge. VulnCheck sells a Cyber Threat Intelligence platform that provides exploit and vulnerability intelligence for prioritizing and remediating vulnerabilities. CISO Tribune files both under Threat intelligence. This page sets the two records side by side: what each sells, where it is based, who owns and funds it, the customers it names and its recent news, each fact numbered to its source.

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Up to four companies side by side.

  • GreyNoise
  • VulnCheck
GreyNoise vs VulnCheck: Products, Customers and Funding Compared
GreyNoiseGreyNoise sells real-time network threat intelligence built on traffic it observes at the network edge.greynoise.ioVulnCheckVulnCheck sells a Cyber Threat Intelligence platform that provides exploit and vulnerability intelligence for prioritizing and remediating vulnerabilities.vulncheck.com
What it sells
  • GreyNoise Block[5][11]Real-time blocklists for firewalls, labelled as being for small and mid-sized teams.
  • GreyNoise Platform[4]Platform to investigate any IP or CVE, catch threats hitting the edge, and turn intelligence into automated action.
  • Exploit & Vulnerability Intelligence[1][4][5][10][11][15]Early access to new vulnerability information not found in the NVD, with dozens of unique fields.
  • Initial Access Intelligence[1][5][8]In-house developed exploit PoCs, packet captures and Suricata signatures for initial access vulnerabilities.
  • VulnCheck for Government[16]Features, functionality and data available only to Government partners.
Categories
Headquarters
Washington, United StatesLexington, United States[3]
Founded
Not stated on its pagesNot stated on its pages
Ownership and funding
Not stated on its pagesPrivately held[2]
Named customers
Not stated on its pagesNot stated on its pages
Recent news
Not stated on its pages
  • February 17, 2026VulnCheck announced it raised $25 million in new funding to scale its growth and expand its intelligence capabilities.[19]
  • February 17, 2026VulnCheck announced a $25 million Series B round led by Sorenson Capital, with National Grid Partners and existing investors also taking part.[12]
  • February 17, 2026Axios reported that VulnCheck raised a $25 million Series B round led by Sorenson Capital.[14]
  • December 8, 2025VulnCheck announced two executive hires: Mike Price as Vice President of Product & Engineering and Jon Loehr as Vice President of Finance.[13]
G2 and Gartner Peer Insights
  • G2: listed, seen November 5, 2026[13]
  • Gartner Peer Insights: Not stated on its pages
  • G2: Not stated on its pages
  • Gartner Peer Insights: Not stated on its pages
Who it fits
From its own pages, GreyNoise sells to enterprise SOCs and to government and national defense operators, with the full platform aimed at organizations of more than 2,500 employees and MSSPs. GreyNoise Block is labelled as being for small and mid-sized teams, and GreyNoise calls it ideal for organizations with fewer than 2,500 employees. GreyNoise says its intelligence plugs into SIEM, SOAR, TIP, and firewall tools that security teams already run. GreyNoise also describes threat hunting teams and vulnerability management teams as users.Not written yet
Last verified
September 27, 2026November 2, 2026

Where they overlap

  • Threat intelligence is the primary category of both GreyNoise and VulnCheck.
  • Both are headquartered in the United States.

Where they differ, field by field

  • VulnCheck is also filed under Vulnerability management.
  • GreyNoise lists GreyNoise Block and GreyNoise Platform. VulnCheck lists Exploit & Vulnerability Intelligence, Initial Access Intelligence and VulnCheck for Government.
  • GreyNoise is headquartered in Washington, United States. VulnCheck is headquartered in Lexington, United States.
  • VulnCheck is privately held.

How they differ

CISO Tribune files both GreyNoise and VulnCheck under Threat intelligence as the primary category, and files VulnCheck under Vulnerability management as well. GreyNoise sells real-time network threat intelligence built on traffic it observes at the network edge. Its products are GreyNoise Block, a set of firewall blocklists, and the GreyNoise Platform, used to investigate any IP or CVE. VulnCheck sells exploit and vulnerability intelligence, including early access to vulnerability information not found in the NVD. It also sells Initial Access Intelligence, which covers exploit PoCs, packet captures and Suricata signatures, and VulnCheck for Government, which is available only to Government partners.

VulnCheck says its exploitation timeline covers when a vulnerability was first disclosed, when exploitation was first discovered and when it was remediated. GreyNoise says 80+ integrations push its intelligence into SIEM, SOAR, TIP, firewalls, and agentic SOC tools. GreyNoise says it sells to enterprise SOCs and to government and national defense operators. GreyNoise is headquartered in Washington, United States, while VulnCheck is headquartered in Lexington, United States. VulnCheck is privately held.

On February 17, 2026, VulnCheck announced a $25 million Series B round led by Sorenson Capital, with National Grid Partners and existing investors also taking part. On December 8, 2025, VulnCheck announced two executive hires.

What it sells: GreyNoise

What GreyNoise Block does[5][11]
GreyNoise Block turns primary-source edge intelligence from the Global Observation Grid into blocklists for firewalls. Blocklists deploy as standard External Dynamic Lists over HTTPS. GreyNoise says lists refresh every hour. It also offers dozens of out-of-box blocklist templates.
What GreyNoise Platform does[4]
GreyNoise says its platform lets users investigate, enrich, and search GreyNoise's view of the whole internet, for one IP or thousands. Dynamic blocklists turn any GNQL query into a live, API-authenticated URL any firewall or WAF can ingest. Feeds and alerts stream events to a SIEM, SOAR, email, or webhook in real time.

What it sells: VulnCheck

What Exploit & Vulnerability Intelligence does[1][4][5][10][11][15]
Exploit & Vulnerability Intelligence is offered for decisions on which vulnerabilities need immediate remediation. It gives early access to new vulnerability information not found in the NVD, along with dozens of unique fields. It includes an exploitation timeline covering when a vulnerability was first disclosed, when evidence of exploitation was first discovered and when it was remediated.
What Initial Access Intelligence does[1][5][8]
VulnCheck develops exploit PoCs, packet captures, and Suricata signatures in house. They are used to defend against initial access vulnerabilities.
What VulnCheck for Government does[16]
VulnCheck for Government includes features, functionality and data. They are available only to VulnCheck's Government partners.

Questions about GreyNoise and VulnCheck

What do GreyNoise and VulnCheck sell?
GreyNoise sells GreyNoise Block and GreyNoise Platform. VulnCheck sells Exploit & Vulnerability Intelligence, Initial Access Intelligence and VulnCheck for Government.
Are GreyNoise and VulnCheck in the same category?
Yes. Threat intelligence is the primary category of both on CISO Tribune.
Where are GreyNoise and VulnCheck headquartered?
GreyNoise is headquartered in Washington, United States. VulnCheck is headquartered in Lexington, United States.
Who owns GreyNoise and VulnCheck?
VulnCheck is privately held.
Who are GreyNoise and VulnCheck sold to?
From its own pages, GreyNoise sells to enterprise SOCs and to government and national defense operators, with the full platform aimed at organizations of more than 2,500 employees and MSSPs.
What have GreyNoise and VulnCheck announced recently?
February 17, 2026: VulnCheck announced it raised $25 million in new funding to scale its growth and expand its intelligence capabilities.

About GreyNoise

GreyNoise sells real-time network threat intelligence built on traffic it observes at the network edge. GreyNoise says it watches and analyzes malicious edge traffic in real-time, so customers can block novel exploitation, catch compromised devices, and investigate critical alerts as they happen.[3]

GreyNoise describes its platform as a single place to investigate any IP or CVE, catch threats hitting the edge, and turn intelligence into automated action. On the platform, users can investigate, enrich, and search GreyNoise's view of the whole internet, for one IP or thousands. GreyNoise says its platform returns a first-hand verdict of malicious, benign, or suspicious for any IP looked up.[4]

GreyNoise says a global grid of thousands of sensors observes attackers first-hand. Customers can also deploy GreyNoise sensors that impersonate vulnerable software to draw out attackers, then capture and analyze every packet. GreyNoise says Session Explorer delivers packet-level forensics and full PCAP export across sensor traffic.[3][4]

For action, GreyNoise says dynamic blocklists turn any GNQL query into a live, API-authenticated URL that any firewall or WAF can ingest. Feeds and alerts stream chosen events to a SIEM, SOAR, email, or webhook in real time. GreyNoise says 80+ integrations push its intelligence into SIEM, SOAR, TIP, firewalls, and agentic SOC tools.[3][4][11]

GreyNoise describes several use cases. For alert reduction, GreyNoise says it reduces alert fatigue by classifying IPs as benign, malicious, or suspicious. For threat hunting, GreyNoise says it filters out opportunistic probes, benign scanners, and botnet noise to reveal statistically significant anomalies that represent targeted attacks. For vulnerability prioritization, GreyNoise says that, unlike static severity and probability scores, it supplies real-time, primary-sourced intelligence on attacks it sees in-the-wild.[7][8][9]

GreyNoise also addresses early warning and compromised devices. GreyNoise says its research shows that spikes in traffic targeting older CVEs often precede new CVE disclosures for that same vendor within weeks. For compromised assets, GreyNoise says it uses two signals: an IP that shows up as a scanner in GreyNoise, and outbound traffic that matches a confirmed callback IP. For investigations, GreyNoise says it adds context on IPs and CVEs seen in mass scanning and exploitation campaigns, which speeds triage and reduces manual work.[6][10][12]

GreyNoise Block is labelled as being for small and mid-sized teams. GreyNoise Block turns primary-source edge intelligence from the Global Observation Grid into precision blocklists for firewalls. GreyNoise says blocklists deploy as standard External Dynamic Lists over HTTPS and refresh every hour. GreyNoise says GreyNoise Block is ideal for organizations with less than 2,500 employees, while organizations with more than 2,500 employees or MSSPs are pointed to the full GreyNoise platform. A 14-day free trial is offered for GreyNoise Block.[5][11]

GreyNoise also offers versions of its message for government and enterprise audiences. GreyNoise says it gives enterprise SOCs real-time edge intelligence inside the tools they already run. GreyNoise says it turns edge reconnaissance and exploitation into early warning signals for national defense operators.[1][2][3][5][6][7][9][10][11]

GreyNoise on the record

Sources

GreyNoise full record

  1. [1]Greynoise raises 15 million in series a funding to fight cyber distractions and mass vulnerability exploitationGreyNoise · greynoise.io · published June 15, 2022 · Tier A
  2. [2]ContactGreyNoise · greynoise.io · undated page, accessed September 27, 2026 · Tier A
  3. [3]GreyNoise | Real-Time Network Threat IntelligenceGreyNoise · undated page, accessed October 25, 2026 · Tier A
  4. [4]GreyNoise Platform | Detect, Investigate & Respond FasterGreyNoise · undated page, accessed October 25, 2026 · Tier A
  5. [5]GreyNoise BlockGreyNoise · undated page, accessed October 25, 2026 · Tier A
  6. [6]Early Warning Signs of CVEs | GreyNoise IntelligenceGreyNoise · undated page, accessed October 25, 2026 · Tier A
  7. [7]Threat Hunting | GreyNoise IntelligenceGreyNoise · undated page, accessed October 25, 2026 · Tier A
  8. [8]SOC Efficiency | GreyNoise IntelligenceGreyNoise · undated page, accessed October 25, 2026 · Tier A
  9. [9]Vulnerability Prioritization | GreyNoise IntelligenceGreyNoise · undated page, accessed October 25, 2026 · Tier A
  10. [10]Incident Investigation | GreyNoise IntelligenceGreyNoise · undated page, accessed October 25, 2026 · Tier A
  11. [11]Pricing - Request a quote | GreyNoise BlockGreyNoise · undated page, accessed October 25, 2026 · Tier A
  12. [12]Compromised Asset Detection | GreyNoise IntelligenceGreyNoise · undated page, accessed November 5, 2026 · Tier A
  13. [13]GreyNoise Reviews 2026: Details, Pricing, & Features - G2G2 · undated page, accessed November 5, 2026 · Tier C

VulnCheck full record

  1. [1]vulncheck.comVulnCheck · vulncheck.com · undated page, accessed September 27, 2026 · Tier A
  2. [2]Series aVulnCheck · vulncheck.com · published March 18, 2025 · Tier A
  3. [3]PrivacyVulnCheck · vulncheck.com · undated page, accessed September 27, 2026 · Tier A
  4. [4]Introduction - VulnCheck DocsVulnCheck · undated page, accessed October 30, 2026 · Tier A
  5. [5]VulnCheck - Outpace AdversariesVulnCheck · undated page, accessed October 30, 2026 · Tier A
  6. [6]Canary Intelligence - VulnCheck DocsVulnCheck · undated page, accessed October 30, 2026 · Tier A
  7. [7]Target Intelligence - VulnCheck DocsVulnCheck · undated page, accessed October 30, 2026 · Tier A
  8. [8]Initial Access Intelligence - VulnCheck DocsVulnCheck · undated page, accessed October 30, 2026 · Tier A
  9. [9]Query Parameters - VulnCheck DocsVulnCheck · undated page, accessed October 30, 2026 · Tier A
  10. [10]Package Manager Support - VulnCheck DocsVulnCheck · undated page, accessed October 30, 2026 · Tier A
  11. [11]NVD Migration - VulnCheck DocsVulnCheck · undated page, accessed October 30, 2026 · Tier A
  12. [12]VulnCheck Raises $25M Series B Financing to Address Surging Demand for its Exploit Intelligence SolutionsVulnCheck · published February 17, 2026 · Tier A
  13. [13]VulnCheck Announces Strategic Leadership Appointments to Accelerate GrowthVulnCheck · published December 8, 2025 · Tier A
  14. [14]Exclusive: VulnCheck nabs $25M Series B fundingAxios · published February 17, 2026 · Tier B
  15. [15]Exploit & Vulnerability Intelligence | Products | VulnCheckVulnCheck · undated page, accessed November 10, 2026 · Tier A
  16. [16]Products | VulnCheckVulnCheck · undated page, accessed November 10, 2026 · Tier A
  17. [17]Company | VulnCheckVulnCheck · undated page, accessed November 10, 2026 · Tier A
  18. [18]Service Terms | VulnCheckVulnCheck · published April 20, 2026 · Tier A
  19. [19]VulnCheck raises $25M to expand real-time exploit intelligence platformSiliconANGLE · published February 17, 2026 · Tier B

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