Vulnerability Details CVE-2021-21401
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 42.5%
CVSS Severity
CVSS v3 Score 7.1
CVSS v2 Score 5.5
References
- https://github.com/nanopb/nanopb/blob/c9124132a604047d0ef97a09c0e99cd9bed2c818/CHANGELOG.txt#L1
- https://github.com/nanopb/nanopb/commit/e2f0ccf939d9f82931d085acb6df8e9a182a4261
- https://github.com/nanopb/nanopb/issues/647
- https://github.com/nanopb/nanopb/security/advisories/GHSA-7mv5-5mxh-qg88
- https://github.com/nanopb/nanopb/blob/c9124132a604047d0ef97a09c0e99cd9bed2c818/CHANGELOG.txt#L1
- https://github.com/nanopb/nanopb/commit/e2f0ccf939d9f82931d085acb6df8e9a182a4261
- https://github.com/nanopb/nanopb/issues/647
- https://github.com/nanopb/nanopb/security/advisories/GHSA-7mv5-5mxh-qg88
Products affected by CVE-2021-21401
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cpe:2.3:a:nanopb_project:nanopb:-
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cpe:2.3:a:nanopb_project:nanopb:0.1.0
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cpe:2.3:a:nanopb_project:nanopb:0.1.1
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cpe:2.3:a:nanopb_project:nanopb:0.1.2
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cpe:2.3:a:nanopb_project:nanopb:0.1.3
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cpe:2.3:a:nanopb_project:nanopb:0.1.4
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cpe:2.3:a:nanopb_project:nanopb:0.1.5
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cpe:2.3:a:nanopb_project:nanopb:0.1.6
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cpe:2.3:a:nanopb_project:nanopb:0.1.7
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cpe:2.3:a:nanopb_project:nanopb:0.1.8
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cpe:2.3:a:nanopb_project:nanopb:0.1.9
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cpe:2.3:a:nanopb_project:nanopb:0.1.9.1
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cpe:2.3:a:nanopb_project:nanopb:0.2.0
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cpe:2.3:a:nanopb_project:nanopb:0.2.1
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cpe:2.3:a:nanopb_project:nanopb:0.2.2
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cpe:2.3:a:nanopb_project:nanopb:0.2.3
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cpe:2.3:a:nanopb_project:nanopb:0.2.4
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cpe:2.3:a:nanopb_project:nanopb:0.2.5
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cpe:2.3:a:nanopb_project:nanopb:0.2.6
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cpe:2.3:a:nanopb_project:nanopb:0.2.7
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cpe:2.3:a:nanopb_project:nanopb:0.2.8
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cpe:2.3:a:nanopb_project:nanopb:0.2.9
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cpe:2.3:a:nanopb_project:nanopb:0.2.9.1
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cpe:2.3:a:nanopb_project:nanopb:0.2.9.2
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cpe:2.3:a:nanopb_project:nanopb:0.2.9.3
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cpe:2.3:a:nanopb_project:nanopb:0.2.9.4
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cpe:2.3:a:nanopb_project:nanopb:0.3.0
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cpe:2.3:a:nanopb_project:nanopb:0.3.1
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cpe:2.3:a:nanopb_project:nanopb:0.3.2
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cpe:2.3:a:nanopb_project:nanopb:0.3.3
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cpe:2.3:a:nanopb_project:nanopb:0.3.4
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cpe:2.3:a:nanopb_project:nanopb:0.3.5
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cpe:2.3:a:nanopb_project:nanopb:0.3.6
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cpe:2.3:a:nanopb_project:nanopb:0.3.7
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cpe:2.3:a:nanopb_project:nanopb:0.3.8
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cpe:2.3:a:nanopb_project:nanopb:0.3.9
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cpe:2.3:a:nanopb_project:nanopb:0.3.9.1
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cpe:2.3:a:nanopb_project:nanopb:0.3.9.2
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cpe:2.3:a:nanopb_project:nanopb:0.3.9.3
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cpe:2.3:a:nanopb_project:nanopb:0.3.9.4
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cpe:2.3:a:nanopb_project:nanopb:0.3.9.5
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cpe:2.3:a:nanopb_project:nanopb:0.3.9.6
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cpe:2.3:a:nanopb_project:nanopb:0.3.9.7
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cpe:2.3:a:nanopb_project:nanopb:0.4.0
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cpe:2.3:a:nanopb_project:nanopb:0.4.1
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cpe:2.3:a:nanopb_project:nanopb:0.4.2
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cpe:2.3:a:nanopb_project:nanopb:0.4.3
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cpe:2.3:a:nanopb_project:nanopb:0.4.4