apache http-server CVE-2021-44790 vulnerability in Apache and Other Products
Published on December 20, 2021

Possible buffer overflow when parsing multipart content in mod_lua of Apache HTTP Server 2.4.51 and earlier

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A carefully crafted request body can cause a buffer overflow in the mod_lua multipart parser (r:parsebody() called from Lua scripts). The Apache httpd team is not aware of an exploit for the vulnerabilty though it might be possible to craft one. This issue affects Apache HTTP Server 2.4.51 and earlier.

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Timeline

Reported to security team

Fixed by r1896039 in 2.4.x 9 days later.

Weakness Type

What is a Memory Corruption Vulnerability?

The software writes data past the end, or before the beginning, of the intended buffer. Typically, this can result in corruption of data, a crash, or code execution. The software may modify an index or perform pointer arithmetic that references a memory location that is outside of the boundaries of the buffer. A subsequent write operation then produces undefined or unexpected results.

CVE-2021-44790 has been classified to as a Memory Corruption vulnerability or weakness.


Products Associated with CVE-2021-44790

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Affected Versions

Apache Software Foundation Apache HTTP Server:

Exploit Probability

EPSS
87.09%
Percentile
99.42%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.