CVE-2009-3555

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 3.7%, top 12% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Weaponized
9.8
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • 97 internet-exposed hosts are running an affected version right now
  • High exploitation likelihood — EPSS 87%
CISA-KEV: Not listedEPSS: 87%CVSS: 9.8Exploit: NoneExposed: 97

A fix is available — apply it.

The TLS protocol, and the SSL protocol 3.0 and possibly earlier, as used in Microsoft Internet Information Services (IIS) 7.0, mod_ssl in the Apache HTTP Server 2.2.14 and earlier, OpenSSL before 0.9.8l, GnuTLS 2.8.5 and earlier, Mozilla Network Security Services (NSS) 3.12.4 and earlier, multiple Cisco products, and other products, does not properly associate renegotiation handshakes with an existing connection, which allows man-in-the-middle attackers to insert data into HTTPS sessions, and possibly other types of sessions protected by TLS or SSL, by sending an unauthenticated request that is processed retroactively by a server in a post-renegotiation context, related to a "plaintext injection" attack, aka the "Project Mogul" issue.

Live · internet exposure

97 internet-exposed hosts are running an affected version of CVE-2009-3555 right now.

across 23 countries (United States, Poland, Japan, Netherlands, United Kingdom)top: http_server, nginx
See the live KEV-Exposure radar →Found passively from public internet-scan data — aggregate, host-redacted.

EchelonGraph is the only CVE feed that fuses live vulnerability intelligence with its own live internet-exposure radar — so you see not just that a CVE is exploited, but how much of the internet is exposed to it right now.

CVSS v3
9.8
EG Score
9.8(medium)
EPSS
99.7%
KEV
Not listed

Published

November 9, 2009

Last Modified

May 27, 2026

Advisory Details (1)

Auto-updated Jun 20, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

G-SEC - Blog: TLS / SSLv3 renegotiation vulnerability explained (Update #2)(

http://blog.g-sec.lu/2009/11/tls-sslv3-renegotiation-vulnerability.html

Vendor Advisories for CVE-2009-3555(20)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(30)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuopenjdk-6-jre-headless (6b18-1.8.2-4ubuntu1) @ maverick2026-05-30ubuntu
ubuntuapache2-common (2.0.55-4ubuntu2.11) @ dapper2026-05-30ubuntu
ubuntulibssl0.9.8 (0.9.8k-7ubuntu8.1) @ lucid2026-05-30ubuntu
redhatxstream-0:1.3.1-10.el72015-08-12redhat
redhatjava-1.6.0-ibm-1:1.6.0.9.1-1jpp.1.el52011-06-16redhat
redhatjava-1.6.0-ibm-1:1.6.0.9.0-1jpp.3.el52010-12-15redhat
redhatjava-1.4.2-ibm-sap-0:1.4.2.13.6.sap-1jpp.1.el52010-12-15redhat
redhatjava-1.6.0-openjdk-1:1.6.0.0-1.31.b17.el6_02010-11-10redhat
redhatjava-1.5.0-ibm-1:1.5.0.12.2-1jpp.1.el52010-10-27redhat
redhatjava-1.4.2-ibm-0:1.4.2.13.6-1jpp.2.el52010-10-20redhat
redhatjava-1.6.0-sun-1:1.6.0.22-1jpp.1.el52010-10-14redhat
redhatjava-1.6.0-openjdk-1:1.6.0.0-1.16.b17.el52010-10-13redhat
redhatrhev-hypervisor-0:5.4-2.1.12.1.el5_4rhev2_12010-05-25redhat
redhatjava-1.4.2-ibm-0:1.4.2.13.4.sap-1jpp.1.el52010-05-12redhat
redhatjava-1.5.0-sun-0:1.5.0.22-1jpp.3.el52010-04-01redhat
redhatjava-1.6.0-openjdk-1:1.6.0.0-1.11.b16.el52010-04-01redhat
redhatjava-1.6.0-sun-1:1.6.0.19-1jpp.1.el52010-04-01redhat
redhatopenssl097a-0:0.9.7a-9.el5_4.22010-03-25redhat
redhatgnutls-0:1.4.1-3.el5_4.82010-03-25redhat
redhatgnutls-0:1.0.20-4.el4_8.72010-03-25redhat
redhatopenssl-0:0.9.7a-43.17.el4_8.52010-03-25redhat
redhatnss-0:3.12.6-1.el5_42010-03-25redhat
redhatopenssl-0:0.9.8e-12.el5_4.62010-03-25redhat
redhatjava-1.4.2-ibm-0:1.4.2.13.4-1jpp.1.el52010-03-17redhat
redhatjava-1.5.0-ibm-1:1.5.0.11.1-1jpp.3.el52010-03-03redhat
redhattomcat-native-0:1.1.19-2.0.1.ep5.el52010-02-23redhat
redhathttpd-0:2.2.10-11.ep5.el52010-01-06redhat
redhatjava-1.6.0-ibm-1:1.6.0.7-1jpp.2.el52009-12-23redhat
redhathttpd-0:2.0.52-41.ent.62009-11-11redhat
redhathttpd-0:2.2.3-31.el5_4.22009-11-11redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
Maven(1)
PackageVulnerable rangeFixed inDependents
org.apache.tomcat:tomcat—5.5.33—

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(8)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 1× in last 7d / 15× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-22 14:03 UTCEPSS rescore
  2. 2026-07-15 16:54 UTCEPSS rescore
  3. 2026-07-15 16:54 UTCEPSS rescore
  4. 2026-07-13 06:07 UTCEPSS rescore
  5. 2026-07-11 08:22 UTCEPSS rescore
  6. 2026-07-11 08:22 UTCEPSS rescore
  7. 2026-07-07 15:11 UTCOSV refresh
  8. 2026-07-05 02:26 UTCEPSS rescore
  9. 2026-07-05 02:26 UTCEPSS rescore
  10. 2026-06-28 04:52 UTCEPSS rescore
  11. 2026-06-28 04:52 UTCEPSS rescore
  12. 2026-06-24 14:02 UTCEPSS rescore
  13. 2026-06-24 14:02 UTCEPSS rescore
  14. 2026-06-23 21:29 UTCEPSS rescore
  15. 2026-06-23 21:29 UTCEPSS rescore
  16. 2026-06-21 14:53 UTCEPSS rescore
  17. 2026-06-19 02:35 UTCOSV refresh
  18. 2026-06-17 17:49 UTCEPSS rescore
  19. 2026-06-17 17:49 UTCEPSS rescore
  20. 2026-06-15 17:44 UTCEPSS rescore
  21. 2026-06-14 23:14 UTCEPSS rescore
  22. 2026-06-14 23:14 UTCEPSS rescore
  23. 2026-06-13 22:57 UTCEPSS rescore
  24. 2026-06-12 23:08 UTCEPSS rescore
  25. 2026-06-12 23:08 UTCEPSS rescore
Show 38 more
  1. 2026-06-10 22:14 UTCEPSS rescore
  2. 2026-06-10 13:17 UTCEPSS rescore
  3. 2026-06-07 15:22 UTCEPSS rescore
  4. 2026-06-07 15:22 UTCEPSS rescore
  5. 2026-06-06 13:44 UTCEPSS rescore
  6. 2026-06-06 13:44 UTCEPSS rescore
  7. 2026-06-06 13:44 UTCEPSS rescore
  8. 2026-06-05 22:44 UTCEPSS rescore
  9. 2026-06-05 22:44 UTCEPSS rescore
  10. 2026-06-02 20:10 UTCEPSS rescore
  11. 2026-06-02 20:10 UTCEPSS rescore
  12. 2026-06-01 13:49 UTCEPSS rescore
  13. 2026-06-01 13:49 UTCEPSS rescore
  14. 2026-05-31 22:28 UTCEPSS rescore
  15. 2026-05-31 22:28 UTCEPSS rescore
  16. 2026-05-31 00:13 UTCEPSS rescore
  17. 2026-05-31 00:13 UTCEPSS rescore
  18. 2026-05-30 14:41 UTCEG score recompute
  19. 2026-05-30 14:41 UTCVendor advisory
  20. 2026-05-29 13:40 UTCEPSS rescore
  21. 2026-05-28 14:36 UTCOSV refresh
  22. 2026-05-28 13:42 UTCEPSS rescore
  23. 2026-05-28 13:42 UTCEPSS rescore
  24. 2026-05-28 13:42 UTCEPSS rescore
  25. 2026-05-27 13:38 UTCEPSS rescore
  26. 2026-05-27 13:38 UTCEPSS rescore
  27. 2026-05-26 13:41 UTCEPSS rescore
  28. 2026-05-26 13:41 UTCEPSS rescore
  29. 2026-05-26 07:16 UTCEPSS rescore
  30. 2026-05-26 07:16 UTCEPSS rescore
  31. 2026-05-24 16:43 UTCEPSS rescore
  32. 2026-05-22 21:15 UTCEPSS rescore
  33. 2026-05-22 21:15 UTCEPSS rescore
  34. 2026-05-20 22:37 UTCEPSS rescore
  35. 2026-05-20 22:37 UTCEPSS rescore
  36. 2026-05-20 11:21 UTCEPSS rescore
  37. 2026-05-20 11:20 UTCEPSS rescore
  38. 2026-05-18 21:29 UTCEPSS rescore

Publicly available exploits

(3 references)

Working exploit code is in the public domain (1 GitHub PoC) (2 Exploit-DB entries). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCjohnwchadwick/cve-2009-3555-test-server
    First seen Mar 30, 2022

    A TLS server using a vendored fork of the Go TLS stack that has renegotation indication extension forcibly disabled.

    Open source ↗
  • Exploit-DBEDB-10579✓ verified
    First seen Dec 21, 2009

    TLS - Renegotiation

    Open source ↗
  • Exploit-DBEDB-10071✓ verified
    First seen Nov 10, 2009

    Mozilla NSS - NULL Character CA SSL Certificate Validation Security Bypass

    Open source ↗

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2009-3555?
CVE-2009-3555 is a critical vulnerability published on November 9, 2009. The TLS protocol, and the SSL protocol 3.0 and possibly earlier, as used in Microsoft Internet Information Services (IIS) 7.0, mod_ssl in the Apache HTTP Server 2.2.14 and earlier, OpenSSL before 0.9.8l, GnuTLS 2.8.5 and earlier, Mozilla Network Security Services (NSS) 3.12.4 and earlier, multiple…
When was CVE-2009-3555 disclosed?
CVE-2009-3555 was first published in the National Vulnerability Database on November 9, 2009, with the most recent update on May 27, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2009-3555 actively exploited?
CVE-2009-3555 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 99.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2009-3555?
CVE-2009-3555 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2009-3555?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2009-3555, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2009-3555

Explore →

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