CVE-2021-21401

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Source
https://nvd.nist.gov/vuln/detail/CVE-2021-21401
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2021-21401.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2021-21401
Aliases
Downstream
Related
Published
2021-03-23T18:15:13Z
Modified
2025-10-15T12:26:28.070392Z
Severity
  • 7.1 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L CVSS Calculator
Summary
[none]
Details

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.

References

Affected packages

Git / github.com/nanopb/nanopb

Affected ranges

Type
GIT
Repo
https://github.com/nanopb/nanopb
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
e2f0ccf939d9f82931d085acb6df8e9a182a4261

Affected versions

0.*

0.3.6
0.3.7
0.3.8
0.3.9
0.3.9.2
0.4.0
0.4.1
0.4.2
0.4.3
0.4.4

nanopb-0.*

nanopb-0.1.0
nanopb-0.1.1
nanopb-0.1.2
nanopb-0.1.3
nanopb-0.1.4
nanopb-0.1.5
nanopb-0.1.6
nanopb-0.1.7
nanopb-0.1.8
nanopb-0.1.9
nanopb-0.2.0
nanopb-0.2.1
nanopb-0.2.2
nanopb-0.2.3
nanopb-0.2.4
nanopb-0.2.5
nanopb-0.2.6
nanopb-0.2.7
nanopb-0.2.8
nanopb-0.2.9
nanopb-0.3.0
nanopb-0.3.1
nanopb-0.3.2
nanopb-0.3.3
nanopb-0.3.4
nanopb-0.3.5
nanopb-0.3.6
nanopb-0.3.7
nanopb-0.3.8
nanopb-0.3.9
nanopb-0.3.9.2
nanopb-0.4.0
nanopb-0.4.0-dev
nanopb-0.4.1
nanopb-0.4.2
nanopb-0.4.3
nanopb-0.4.4

Database specific

vanir_signatures

[
    {
        "target": {
            "function": "pb_release_union_field",
            "file": "pb_decode.c"
        },
        "id": "CVE-2021-21401-1bc41359",
        "signature_type": "Function",
        "signature_version": "v1",
        "deprecated": false,
        "source": "https://github.com/nanopb/nanopb/commit/e2f0ccf939d9f82931d085acb6df8e9a182a4261",
        "digest": {
            "function_hash": "135569156852612219065699278227514311302",
            "length": 325.0
        }
    },
    {
        "target": {
            "file": "pb_decode.c"
        },
        "id": "CVE-2021-21401-ba7b2709",
        "signature_type": "Line",
        "signature_version": "v1",
        "deprecated": false,
        "source": "https://github.com/nanopb/nanopb/commit/e2f0ccf939d9f82931d085acb6df8e9a182a4261",
        "digest": {
            "line_hashes": [
                "61013708987579731352987091476408286170",
                "327087506916403461653276454963703349803",
                "44894250810108914257220512929796472898"
            ],
            "threshold": 0.9
        }
    }
]