Is CVE-2011-4577 in the CISA KEV catalog?

No. CVE-2011-4577 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2011-4577?

CVE-2011-4577 has a CVSS v2 base score of 4.3 (MEDIUM).

What is the EPSS score for CVE-2011-4577?

CVE-2011-4577 has an EPSS score of 9.33% (95th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2011-4577?

Upgrade openssl on debian 11 to 1.0.0f-1 or later.

CVE & CISA-KEV Catalog

CVE-2011-4577

MEDIUMEPSS 95th pctl

4.3

CVSS v2

NVD

Description

OpenSSL before 0.9.8s and 1.x before 1.0.0f, when RFC 3779 support is enabled, allows remote attackers to cause a denial of service (assertion failure) via an X.509 certificate containing certificate-extension data associated with (1) IP address blocks or (2) Autonomous System (AS) identifiers.

CWE-399Resource Management Errors

How to fix

Remediation Available

opensslDebian

Fixed in:1.0.0f-1CVE-2011-4577

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

9.33%probability of exploitation in 30 days

95thpercentile

High risk: more likely to be exploited than 95% of all known CVEs.

References

Government Resource1

kb.cert.org

Other references11

Related Vulnerabilities

Other CWE-399 (Resource Management Errors) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2009-3103	High	10.0	90%	-	-
CVE-2009-0075	High	9.3	85%	-	-
CVE-2005-1790	Low	2.6	83%	-	-
CVE-2010-0806	High	8.8	82%	KEV	-
CVE-2009-2526	High	7.8	82%	-	-
CVE-2015-1868	High	7.8	82%	-	Fix

Embed a live status badge for CVE-2011-4577

Markdown

[![CVE-2011-4577](https://tridentstack.com/cve/badge/CVE-2011-4577.svg)](https://tridentstack.com/cve/CVE-2011-4577)

HTML

<a href="https://tridentstack.com/cve/CVE-2011-4577"><img src="https://tridentstack.com/cve/badge/CVE-2011-4577.svg" alt="CVE-2011-4577"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

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.