CVE-2012-5533

CVE-2012-5533 is a medium-severity vulnerability in Lighttpd with a CVSS 2.0 base score of 5.0. Its EPSS exploit-prediction score of 12% places it in the 96th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-399.

Key facts

Description

The http_request_split_value function in request.c in lighttpd before 1.4.32 allows remote attackers to cause a denial of service (infinite loop) via a request with a header containing an empty token, as demonstrated using the "Connection: TE,,Keep-Alive" header.

Frequently asked questions

What is CVE-2012-5533?
The http_request_split_value function in request.c in lighttpd before 1.4.32 allows remote attackers to cause a denial of service (infinite loop) via a request with a header containing an empty token, as demonstrated using the "Connection: TE,,Keep-Alive" header.
How severe is CVE-2012-5533?
CVE-2012-5533 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2012-5533 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 12% (96th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2012-5533?
CVE-2012-5533 primarily affects Lighttpd. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2012-5533?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2012-5533 published?
CVE-2012-5533 was published on 2012-11-24 and last updated on 2026-06-16.

References

Affected products (2)

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Threat intelligence

Threat-intel indicators referencing this CVE: