How severe is CVE-2011-4109?

CVE-2011-4109 has a CVSS 2.0 base score of 9.3, rated critical severity.

Is CVE-2011-4109 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 18% (97th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-4109?

CVE-2011-4109 primarily affects Openssl. In total, 19 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2011-4109?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2011-4109 published?

CVE-2011-4109 was published on 2012-01-06 and last updated on 2026-06-16.

CVE-2011-4109

CVE-2011-4109 is a critical-severity vulnerability in Openssl with a CVSS 2.0 base score of 9.3. Its EPSS exploit-prediction score of 18% places it in the 97th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-399.

Key facts

Severity: Critical (CVSS 2.0 base score 9.3)
EPSS exploit prediction: 18% (97th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-399
Affected product: Openssl
Published: 2012-01-06
Last modified: 2026-06-16

Description

Double free vulnerability in OpenSSL 0.9.8 before 0.9.8s, when X509_V_FLAG_POLICY_CHECK is enabled, allows remote attackers to have an unspecified impact by triggering failure of a policy check.

Frequently asked questions

What is CVE-2011-4109?: Double free vulnerability in OpenSSL 0.9.8 before 0.9.8s, when X509_V_FLAG_POLICY_CHECK is enabled, allows remote attackers to have an unspecified impact by triggering failure of a policy check.
How severe is CVE-2011-4109?: CVE-2011-4109 has a CVSS 2.0 base score of 9.3, rated critical severity.
Is CVE-2011-4109 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 18% (97th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-4109?: CVE-2011-4109 primarily affects Openssl. In total, 19 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2011-4109?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2011-4109 published?: CVE-2011-4109 was published on 2012-01-06 and last updated on 2026-06-16.

References

Affected products (19)

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:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.8e:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.8f:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.8g:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.8h:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.8i:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.8j:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.8k:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.8l:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.8m:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.8n:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.8o:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.8p:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.8q:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.8r:*:*:*:*:*:*:*

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)
171.100.156.38 (ipv4-addr)