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Servers and applications

CVE-2006-4339

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.

Severity
Critical 9.1
Published
5 Sept 2006
Last changed
4 Nov 2026
Added to UpHeron
21 Oct 2026
Exploit chance
3.9% in the next 30 daysHigher than 90% of CVEs. EPSS by FIRST, 12 Nov 2026
Weakness
Improper verification of a cryptographic signature (CWE-347)CWE-310
Attack
Over the network · No login needed · No user action needed
Attacker can
Read data · Change data
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Sources
NVD

Affected software

SoftwareAffected versions
OpenSSLServers and applications · cpe:a:openssl:openssl
  • Version 0.9.8b
  • Version 0.9.8a
  • Version 0.9.8
  • Version 0.9.7j
All 45 release lines
  • Every version up to 0.9.7
  • Version 0.9.1c
  • Version 0.9.2b
  • Version 0.9.3
  • Version 0.9.3a
  • Version 0.9.4
  • Version 0.9.5a-beta1
  • Version 0.9.5a-beta2
  • Version 0.9.5-beta1
  • Version 0.9.5-beta2
  • Version 0.9.5
  • Version 0.9.5a
  • Version 0.9.6a-beta1
  • Version 0.9.6a-beta2
  • Version 0.9.6a-beta3
  • Version 0.9.6-beta1
  • Version 0.9.6-beta2
  • Version 0.9.6-beta3
  • Version 0.9.6
  • Version 0.9.6a
  • Version 0.9.6b
  • Version 0.9.6c
  • Version 0.9.6d
  • Version 0.9.6e
  • Version 0.9.6f
  • Version 0.9.6g
  • Version 0.9.6h
  • Version 0.9.6i
  • Version 0.9.6j
  • Version 0.9.6k
  • Version 0.9.6l
  • Version 0.9.6m
  • Version 0.9.7a
  • Version 0.9.7b
  • Version 0.9.7c
  • Version 0.9.7d
  • Version 0.9.7e
  • Version 0.9.7f
  • Version 0.9.7g
  • Version 0.9.7h
  • Version 0.9.7i
  • Version 0.9.7j
  • Version 0.9.8
  • Version 0.9.8a
  • Version 0.9.8b

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2006-4339
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2006-4339