CVE-2006-4339

Publication date 5 September 2006

Last updated 4 November 2026

Ubuntu priority

Cvss 3 Severity Score

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.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
openssl097	7.04 feisty	Fixed in 0.9.7k-3
	6.10 edgy	Fixed in 0.9.7k-3
	6.06 LTS dapper	Fixed in 0.9.7g-5ubuntu1.1
openssl	7.04 feisty	Fixed in 0.9.8b-2ubuntu2
	6.10 edgy	Fixed in 0.9.8b-2ubuntu2
	6.06 LTS dapper	Fixed in 0.9.8a-7ubuntu0.3

Severity score breakdown

CVSS version: CVSS v3.0

Base score 9.1 · Critical

Base metrics

Parameter	Value
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality impact	High
Integrity impact	High
Availability impact	None

Scores

Parameter	Value
Base score	9.1 · Critical
Exploitability score	-
Impact score	-

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

References

Related Ubuntu Security Notices (USN)

USN-339-1
OpenSSL vulnerability
5 September 2006

Other references

https://www.cve.org/CVERecord?id=CVE-2006-4339