Is CVE-2011-4576 in the CISA KEV catalog?

No. CVE-2011-4576 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2011-4576?

CVE-2011-4576 has a CVSS v2 base score of 5.0 (MEDIUM).

What is the EPSS score for CVE-2011-4576?

CVE-2011-4576 has an EPSS score of 14.52% (96th percentile), estimating the probability of exploitation in the next 30 days.

CVE & CISA-KEV Catalog

CVE-2011-4576

MEDIUMEPSS 96th pctl

5.0

CVSS v2

NVD

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.

CWE-310

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

14.52%probability of exploitation in 30 days

96thpercentile

Very high risk: more likely to be exploited than 96% of all known CVEs.

References

http://aix.software.ibm.com/aix/efixes/security/openssl_advisory3.asc
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c03360041
http://lists.apple.com/archives/security-announce/2013/Jun/msg00000.html
http://lists.fedoraproject.org/pipermail/package-announce/2012-November/092905.html
http://lists.opensuse.org/opensuse-security-announce/2012-01/msg00017.html
http://lists.opensuse.org/opensuse-security-announce/2012-01/msg00018.html
http://marc.info/?l=bugtraq&m=132750648501816&w=2
http://marc.info/?l=bugtraq&m=133951357207000&w=2
http://marc.info/?l=bugtraq&m=134039053214295&w=2
http://rhn.redhat.com/errata/RHSA-2012-1306.html
http://rhn.redhat.com/errata/RHSA-2012-1307.html
http://rhn.redhat.com/errata/RHSA-2012-1308.html
http://secunia.com/advisories/48528
http://secunia.com/advisories/55069
http://secunia.com/advisories/57353
http://support.apple.com/kb/HT5784
http://www-01.ibm.com/support/docview.wss?uid=ssg1S1004564
http://www.debian.org/security/2012/dsa-2390
http://www.kb.cert.org/vuls/id/737740
http://www.mandriva.com/security/advisories?name=MDVSA-2012:006
http://www.mandriva.com/security/advisories?name=MDVSA-2012:007
http://www.openssl.org/news/secadv_20120104.txt

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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 2026-04-29.