CVE-2021-21401

Description

Nanopb is a small code-size Protocol Buffers implementation in ansi C. In Nanopb before versions 0.3.9.8 and 0.4.5, decoding a specifically formed message can cause invalid free() or realloc() calls if the message type contains an oneof field, and the oneof directly contains both a pointer field and a non-pointer field. If the message data first contains the non-pointer field and then the pointer field, the data of the non-pointer field is incorrectly treated as if it was a pointer value. Such message data rarely occurs in normal messages, but it is a concern when untrusted data is parsed. This has been fixed in versions 0.3.9.8 and 0.4.5. See referenced GitHub Security Advisory for more information including workarounds.

Risk Information

Base Score

7.1

MODERATE

Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L

EPSS Score

Exploitation Probability

0.199

Associated Vulnerability

Vulnerability	OS Platform
Vulnerabilities CVE-2021-21401 are fixed in Python-nanopb 0.3.9.8	Windows
Vulnerabilities CVE-2021-21401 are fixed in Python-nanopb 0.4.5	Windows
Vulnerabilities CVE-2021-21401 are fixed in Python-nanopb for linux 0.3.9.8	Linux
Vulnerabilities CVE-2021-21401 are fixed in Python-nanopb for linux 0.4.5	Linux

Patch Details

No records found

References

https://nvd.nist.gov/vuln/detail/CVE-2023-1234
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-1234