CVE-2021-21401
Invalid free() call in Nanopb
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.
- Affected
- nanopb
- CVSS v4.0 GitHub
- 7.1 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N - CVSS v3.1 NVD
- 7.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L - CVSS v2.0 NVD
- 5.5 MEDIUM
AV:N/AC:L/Au:S/C:N/I:P/A:P - EPSS
- 1.81% chance of exploitation in the next 30 days, 78th percentile
- Published
- 2021-03-23
- Updated
- 2024-08-03
Proof-of-concept exploits (1)
- uthrasri/CVE-2021-21401_nanopb-c_AOSP10_R330★ · 2024-11-06
Security advisories
- nanopb/nanopb/issues/647
- nanopb/nanopb/security/advisories/GHSA-7mv5-5mxh-qg88
- advisories/GHSA-7mv5-5mxh-qg88