CVE-2011-4576

CVE-2011-4576 is a medium-severity vulnerability in Openssl with a CVSS 2.0 base score of 5.0. Its EPSS exploit-prediction score of 15% places it in the 96th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-310.

Key facts

Description

The SSL 3.0 implementation in OpenSSL before 0.9.8s and 1.x before 1.0.0f does not properly initialize data structures for block cipher padding, which might allow remote attackers to obtain sensitive information by decrypting the padding data sent by an SSL peer.

Frequently asked questions

What is CVE-2011-4576?
The SSL 3.0 implementation in OpenSSL before 0.9.8s and 1.x before 1.0.0f does not properly initialize data structures for block cipher padding, which might allow remote attackers to obtain sensitive information by decrypting the padding data sent by an SSL peer.
How severe is CVE-2011-4576?
CVE-2011-4576 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2011-4576 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 15% (96th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-4576?
CVE-2011-4576 primarily affects Openssl. In total, 63 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2011-4576?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2011-4576 published?
CVE-2011-4576 was published on 2012-01-06 and last updated on 2026-06-16.

References

Affected products (63)

More vulnerabilities in Openssl

All CVEs affecting Openssl →

Other CWE-310 (Cryptographic Issues) vulnerabilities

Browse all CWE-310 (Cryptographic Issues) vulnerabilities →

Threat intelligence

Threat-intel indicators referencing this CVE: