CVE-2013-0166

CVE-2013-0166 is a medium-severity vulnerability in Redhat Openssl with a CVSS 2.0 base score of 5.0. Its EPSS exploit-prediction score of 20% places it in the 97th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-310.

Key facts

Description

OpenSSL before 0.9.8y, 1.0.0 before 1.0.0k, and 1.0.1 before 1.0.1d does not properly perform signature verification for OCSP responses, which allows remote OCSP servers to cause a denial of service (NULL pointer dereference and application crash) via an invalid key.

Frequently asked questions

What is CVE-2013-0166?
OpenSSL before 0.9.8y, 1.0.0 before 1.0.0k, and 1.0.1 before 1.0.1d does not properly perform signature verification for OCSP responses, which allows remote OCSP servers to cause a denial of service (NULL pointer dereference and application crash) via an invalid key.
How severe is CVE-2013-0166?
CVE-2013-0166 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2013-0166 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 20% (97th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2013-0166?
CVE-2013-0166 primarily affects Redhat Openssl. In total, 95 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2013-0166?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2013-0166 published?
CVE-2013-0166 was published on 2013-02-08 and last updated on 2026-06-16.

References

Affected products (95)

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Threat intelligence

Threat-intel indicators referencing this CVE: