No exploitation reportedFix available

CVE-2006-4339

No exploitation reported by the sources we read.

Published2006-09-05
WeaknessCWE-310 · CWE-347

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

A flaw was found in OpenSSL. When configured to use an RSA key with exponent 3, OpenSSL improperly removes PKCS-1 padding before generating a hash. This allows remote attackers to forge PKCS #1 v1.5 signatures. Consequently, OpenSSL may incorrectly verify X.509 and other certificates, leading to a bypass of trust and authentication mechanisms.

Timeline

dates in UTC

2006-09-0517:04CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-31 15:37 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-2006-4339?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2006-4339?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

OpenSSL

Branch	Affected	Fixed in	Source
0.9	≤ 0.9.7	no fix published	NVD
0.9	= 0.9.1c	no fix published	NVD
0.9	= 0.9.2b	no fix published	NVD
0.9	= 0.9.3	no fix published	NVD
0.9	= 0.9.3a	no fix published	NVD
0.9	= 0.9.4	no fix published	NVD
0.9	= 0.9.5	no fix published	NVD
0.9	= 0.9.5a	no fix published	NVD
0.9	= 0.9.6	no fix published	NVD
0.9	= 0.9.6a	no fix published	NVD
0.9	= 0.9.6b	no fix published	NVD
0.9	= 0.9.6c	no fix published	NVD

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

Fix

Advisories and patches

secunia.comPatch · Vendor Advisory
secunia.comVendor Advisory
secunia.comVendor Advisory
secunia.comVendor Advisory
secunia.comVendor Advisory
secunia.comVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.19.1read 2026-10-31
NVDCVSS 2.04.3read 2026-10-31
NVDweakness (CWE)CWE-310, CWE-347read 2026-10-31
FIRST EPSSEPSS score5.1 %2026-10-30

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Published: 2006-09-05
Last Modified: 2026-10-30
NVD status: Modified

Frequently asked questions

What is CVE-2006-4339?

Is CVE-2006-4339 actively exploited?

Active exploitation of CVE-2006-4339 has not been confirmed. Its EPSS score was 5.1% on 2026-10-30, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2006-4339?

CVE-2006-4339 has a CVSS v3 base score of 9.1 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

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