How severe is CVE-2013-4248?

CVE-2013-4248 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2013-4248 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (88th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2013-4248?

CVE-2013-4248 primarily affects Redhat Enterprise Linux. In total, 95 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2013-4248?

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

When was CVE-2013-4248 published?

CVE-2013-4248 was published on 2013-08-18 and last updated on 2026-06-16.

CVE-2013-4248

CVE-2013-4248 is a medium-severity vulnerability in Redhat Enterprise Linux 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-20.

Key facts

Severity: Medium (CVSS 2.0 base score 4.3)
EPSS exploit prediction: 4% (88th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Redhat Enterprise Linux
Published: 2013-08-18
Last modified: 2026-06-16

Description

The openssl_x509_parse function in openssl.c in the OpenSSL module in PHP before 5.4.18 and 5.5.x before 5.5.2 does not properly handle a '\0' character in a domain name in the Subject Alternative Name field of an X.509 certificate, which allows man-in-the-middle attackers to spoof arbitrary SSL servers via a crafted certificate issued by a legitimate Certification Authority, a related issue to CVE-2009-2408.

Frequently asked questions

What is CVE-2013-4248?: The openssl_x509_parse function in openssl.c in the OpenSSL module in PHP before 5.4.18 and 5.5.x before 5.5.2 does not properly handle a '\0' character in a domain name in the Subject Alternative Name field of an X.509 certificate, which allows man-in-the-middle attackers to spoof arbitrary SSL servers via a crafted certificate issued by a legitimate Certification Authority, a related issue to CVE-2009-2408.
How severe is CVE-2013-4248?: CVE-2013-4248 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2013-4248 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (88th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2013-4248?: CVE-2013-4248 primarily affects Redhat Enterprise Linux. In total, 95 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2013-4248?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2013-4248 published?: CVE-2013-4248 was published on 2013-08-18 and last updated on 2026-06-16.

References

Affected products (95)

cpe:2.3:o:canonical:ubuntu_linux:10.04:-:lts:*:*:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:12.04:-:lts:*:*:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:12.10:*:*:*:*:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:13.04:*:*:*:*:*:*:*
cpe:2.3:a:php:php:*:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.0.0:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.0.0:beta1:*:*:*:*:*:*
cpe:2.3:a:php:php:5.0.0:beta2:*:*:*:*:*:*
cpe:2.3:a:php:php:5.0.0:beta3:*:*:*:*:*:*
cpe:2.3:a:php:php:5.0.0:beta4:*:*:*:*:*:*
cpe:2.3:a:php:php:5.0.0:rc1:*:*:*:*:*:*
cpe:2.3:a:php:php:5.0.0:rc2:*:*:*:*:*:*
cpe:2.3:a:php:php:5.0.0:rc3:*:*:*:*:*:*
cpe:2.3:a:php:php:5.0.1:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.0.2:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.0.3:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.0.4:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.0.5:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.1.0:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.1.1:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.1.2:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.1.3:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.1.4:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.1.5:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.1.6:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.2.0:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.2.1:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.2.2:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.2.3:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.2.4:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.2.5:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.2.6:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.2.7:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.2.8:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.2.9:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.2.10:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.2.11:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.2.12:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.2.13:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.2.14:*:*:*:*:*:*:*

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Threat intelligence

Threat-intel indicators referencing this CVE:

45.84.120.3 (ipv4-addr)
221.161.235.168 (ipv4-addr)
187.141.71.166 (ipv4-addr)
187.110.238.50 (ipv4-addr)
116.255.252.44 (ipv4-addr)
113.164.66.10 (ipv4-addr)
103.38.219.22 (ipv4-addr)
103.20.122.54 (ipv4-addr)