CVE-2011-4577

CVE-2011-4577 is a medium-severity vulnerability in Openssl with a CVSS 2.0 base score of 4.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-399.

Key facts

• Severity: Medium (CVSS 2.0 base score 4.3)
• EPSS exploit prediction: 9% (95th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-399
• Affected product: Openssl
• Published: 2012-01-06
• Last modified: 2026-06-16

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.

Frequently asked questions

What is CVE-2011-4577?

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.

How severe is CVE-2011-4577?

CVE-2011-4577 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2011-4577 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 9% (95th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-4577?

CVE-2011-4577 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-2011-4577?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2011-4577 published?

CVE-2011-4577 was published on 2012-01-06 and last updated on 2026-06-16.

References

• 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=134039053214295&w=2
• http://secunia.com/advisories/57353
• http://support.apple.com/kb/HT5784
• http://www-01.ibm.com/support/docview.wss?uid=ssg1S1004564
• http://www.kb.cert.org/vuls/id/737740
• http://www.openssl.org/news/secadv_20120104.txt

Affected products (63)

• cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.1c:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.2b:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.4:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.5:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.5a:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.6:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.6a:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.6b:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.6c:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.6d:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.6e:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.6f:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.6g:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.6h:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.6h:bogus:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.6i:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.6j:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.6k:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.6l:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.6m:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.7:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.7a:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.7b:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.7c:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.7d:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.7e:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.7f:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.7g:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.7h:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.7i:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.7j:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.7k:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.7l:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.7m:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.8:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.8a:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.8b:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.8c:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:0.9.8d:*:*:*:*:*:*:*

More vulnerabilities in Openssl

• CVE-2009-3245 — Critical (CVSS 10.0): OpenSSL before 0.9.8m does not check for a NULL return value from bn_wexpand function calls in (1) crypto/bn/bn_div.c,…
• CVE-2006-3738 — Critical (CVSS 10.0): Buffer overflow in the SSL_get_shared_ciphers function in OpenSSL 0.9.7 before 0.9.7l, 0.9.8 before 0.9.8d, and earlier…
• CVE-2026-31789 — Critical (CVSS 9.8): Issue summary: Converting an excessively large OCTET STRING value to a hexadecimal string leads to a heap buffer…
• CVE-2022-2274 — Critical (CVSS 9.8): The OpenSSL 3.0.4 release introduced a serious bug in the RSA implementation for X86_64 CPUs supporting the AVX512IFMA…
• CVE-2021-3711 — Critical (CVSS 9.8): In order to decrypt SM2 encrypted data an application is expected to call the API function EVP_PKEY_decrypt().…
• CVE-2016-6309 — Critical (CVSS 9.8): statem/statem.c in OpenSSL 1.1.0a does not consider memory-block movement after a realloc call, which allows remote…

All CVEs affecting Openssl →

Other CWE-399 (Resource Management Errors) vulnerabilities

• CVE-2015-8104 — Critical (CVSS 10.0): The KVM subsystem in the Linux kernel through 4.2.6, and Xen 4.3.x through 4.6.x, allows guest OS users to cause a…
• CVE-2015-0339 — Critical (CVSS 10.0): Adobe Flash Player before 13.0.0.277 and 14.x through 17.x before 17.0.0.134 on Windows and OS X and before…
• CVE-2015-0335 — Critical (CVSS 10.0): Adobe Flash Player before 13.0.0.277 and 14.x through 17.x before 17.0.0.134 on Windows and OS X and before…
• CVE-2015-0333 — Critical (CVSS 10.0): Adobe Flash Player before 13.0.0.277 and 14.x through 17.x before 17.0.0.134 on Windows and OS X and before…
• CVE-2014-4121 — Critical (CVSS 10.0): Microsoft .NET Framework 2.0 SP2, 3.5, 3.5.1, 4, 4.5, 4.5.1, and 4.5.2 does not properly parse internationalized…
• CVE-2014-0560 — Critical (CVSS 10.0): Use-after-free vulnerability in Adobe Reader and Acrobat 10.x before 10.1.12 and 11.x before 11.0.09 on Windows and OS…

Browse all CWE-399 (Resource Management Errors) vulnerabilities →

Threat intelligence

Threat-intel indicators referencing this CVE:

• 222.99.52.202 (ipv4-addr)
• 121.164.135.251 (ipv4-addr)
• 90.160.135.217 (ipv4-addr)
• 62.36.19.42 (ipv4-addr)
• 62.36.19.41 (ipv4-addr)
• 47.92.90.255 (ipv4-addr)
• 171.100.156.38 (ipv4-addr)