What is the CVSS score of CVE-2013-6420?

CVE-2013-6420 has a CVSS 2.0 base score of 7.5 (High). CVSS vector: AV:N/AC:L/Au:N/C:P/I:P/A:P. EPSS exploitation probability: 40.2%.

Is there a public PoC exploit available for CVE-2013-6420?

Yes, a public proof-of-concept exploit is available for CVE-2013-6420. Prioritise patching immediately. EPSS: 40.2%.

Is there a patch available for CVE-2013-6420?

Yes, a patch is available for CVE-2013-6420. Update the affected software to the latest version immediately.

PHP CVE-2013-6420

HIGH

Buffer Overflow (CWE-119)

2013-12-17 secalert@redhat.com

Denial Of Service Buffer Overflow PHP OpenSSL RCE Opensuse Mac Os X

7.5

CVSS 2.0 · NVD

Severity by source

NVD PRIMARY

7.5 HIGH

AV:N/AC:L/Au:N/C:P/I:P/A:P

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

AV:N/AC:L/Au:N/C:P/I:P/A:P

Attack Vector

Network

Attack Complexity

Low

Confidentiality

Integrity

Availability

Lifecycle Timeline

CVE Published

Dec 17, 2013 - 04:46 cve.org

HIGH 7.5

DescriptionCVE.org

The asn1_time_to_time_t function in ext/openssl/openssl.c in PHP before 5.3.28, 5.4.x before 5.4.23, and 5.5.x before 5.5.7 does not properly parse (1) notBefore and (2) notAfter timestamps in X.509 certificates, which allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted certificate that is not properly handled by the openssl_x509_parse function.

AnalysisAI

The asn1_time_to_time_t function in ext/openssl/openssl.c in PHP before 5.3.28, 5.4.x before 5.4.23, and 5.5.x before 5.5.7 does not properly parse (1) notBefore and (2) notAfter timestamps in X.509. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, low attack complexity. Public exploit code available and EPSS exploitation probability 40.2%.

Technical ContextAI

This vulnerability is classified as Buffer Overflow (CWE-119), which allows attackers to corrupt memory to execute arbitrary code or crash the application. The asn1_time_to_time_t function in ext/openssl/openssl.c in PHP before 5.3.28, 5.4.x before 5.4.23, and 5.5.x before 5.5.7 does not properly parse (1) notBefore and (2) notAfter timestamps in X.509 certificates, which allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted certificate that is not properly handled by the openssl_x509_parse function. Affected products include: Php, Opensuse, Apple Mac Os X. Version information: before 5.3.28.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Use memory-safe languages or bounds-checking. Enable ASLR, DEP/NX, stack canaries. Use safe string functions.