Public proof of conceptFix available

CVE-2009-3555

A public proof of concept exists; no exploitation attested.

Published2009-11-09
WeaknessCWE-295 · CWE-300

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC

2009-11-0917:30CVE publishedNVD
2026-10-2319:23First public proof of conceptPoC-in-GitHub
2026-10-2319:23EPSS crossed 10 %FIRST EPSS

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2009-3555?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2009-3555?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Canonical ubuntu linux

Branch	Affected	Fixed in	Source
8.4	= 8.04	no fix published	NVD
8.10	= 8.10	no fix published	NVD
9.4	= 9.04	no fix published	NVD
9.10	= 9.10	no fix published	NVD
10.4	= 10.04	no fix published	NVD
10.10	= 10.10	no fix published	NVD

Debian debian linux

Branch	Affected	Fixed in	Source
4.0	= 4.0	no fix published	NVD
5.0	= 5.0	no fix published	NVD
6.0	= 6.0	no fix published	NVD
7.0	= 7.0	no fix published	NVD
8.0	= 8.0	no fix published	NVD

Fedoraproject fedora

Branch	Affected	Fixed in	Source
11.x	= 11	no fix published	NVD
12.x	= 12	no fix published	NVD
13.x	= 13	no fix published	NVD
14.x	= 14	no fix published	NVD

6 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

ICSA-22-160-01 CISA20 known affected
Mitsubishi Electric Air Conditioning Systems
AE-200A: Versions 7.97 and prior · AE-200E: Versions 7.97 and prior · AE-200J: Versions 7.97 and prior · +17 more

Full record on NVD

Fix

Mitigation from the vendor CISA ICSA-22-160-01 · 20 productsG-150AD: Replace the air conditioning systems to AE-200J, AE-50J or EW-50J Version 7.98 or later
Mitigation from the vendor CISA ICSA-22-160-01 · 20 productsAG-150A-A: Replace the air conditioning systems to AE-200A, AE-50A or EW-50A Version 7.98 or later
Mitigation from the vendor CISA ICSA-22-160-01 · 20 productsAG-150A-J: Replace the air conditioning systems to AE-200E, AE-50E or EW-50E Version 7.98 or later
Mitigation from the vendor CISA ICSA-22-160-01 · 20 productsGB-50AD: Replace the air conditioning systems to AE-200J, AE-50J or EW-50J Version 7.98 or later
Mitigation from the vendor CISA ICSA-22-160-01 · 20 productsGB-50ADA-A: Replace the air conditioning systems to AE-200A, AE-50A or EW-50A Version 7.98 or later
Mitigation from the vendor CISA ICSA-22-160-01 · 20 productsGB-50ADA-J: Replace the air conditioning systems to AE-200E, AE-50E or EW-50E Version 7.98 or later

Advisories and patches

www.securityfocus.comPatch
docs.microsoft.comPatch · Vendor Advisory

Detection

read 2026-10-23 19:23 UTC

Nuclei template: none so far
Exploit-DB: EDB-10071 EDB-10579
Proof-of-concept repositories: 1 repository, unverifiedjohnwchadwick/cve-2009-3555-test-server

Sources

CISA-ADPSSVC decisionpoc2026-05-27
OpenCVESSVC decisionpoc—
CISA-ADPCVSS 3.19.82026-05-27
NVDCVSS 2.05.8read 2026-10-23
CISA-ADPweakness (CWE)CWE-3002026-05-27
NVDweakness (CWE)CWE-295read 2026-10-23
FIRST EPSSEPSS score87.3 %read 2026-10-23
PoC-in-GitHubproof of concept1read 2026-10-23
Exploit-DBdetectionread 2026-10-23
OSVaffected packages—

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: 2009-11-09
Last Modified: 2026-06-16
NVD status: Modified

Frequently asked questions

What is CVE-2009-3555?

Is CVE-2009-3555 actively exploited?

A proof-of-concept exploit exists for CVE-2009-3555, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2009-3555?

CVE-2009-3555 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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