Is CVE-2006-4339 in the CISA KEV catalog?

No. CVE-2006-4339 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2006-4339?

CVE-2006-4339 has a CVSS v2 base score of 4.3 (MEDIUM).

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

CVE-2006-4339 has an EPSS score of 4.89% (91th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2006-4339?

Upgrade openssl on debian 11 to 0.9.8b-3 or later.

CVE & CISA-KEV Catalog

CVE-2006-4339

MEDIUMEPSS 91th pctl

4.3

CVSS v2

NVD

Description

OpenSSL before 0.9.7, 0.9.7 before 0.9.7k, and 0.9.8 before 0.9.8c, when using an RSA key with exponent 3, removes PKCS-1 padding before generating a hash, which allows remote attackers to forge a PKCS #1 v1.5 signature that is signed by that RSA key and prevents OpenSSL from correctly verifying X.509 and other certificates that use PKCS #1.

CWE-310Cryptographic Issues

How to fix

Remediation Available

opensslDebian

Fixed in:0.9.8b-3CVE-2006-4339

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

4.89%probability of exploitation in 30 days

91stpercentile

High risk: more likely to be exploited than 91% of all known CVEs.

References

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-16.