CVE-2021-37706

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Source
https://nvd.nist.gov/vuln/detail/CVE-2021-37706
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2021-37706.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2021-37706
Downstream
Related
Published
2021-12-22T18:15:07Z
Modified
2025-09-19T13:08:39.324954Z
Severity
  • 9.8 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
[none]
Details

PJSIP is a free and open source multimedia communication library written in C language implementing standard based protocols such as SIP, SDP, RTP, STUN, TURN, and ICE. In affected versions if the incoming STUN message contains an ERROR-CODE attribute, the header length is not checked before performing a subtraction operation, potentially resulting in an integer underflow scenario. This issue affects all users that use STUN. A malicious actor located within the victim’s network may forge and send a specially crafted UDP (STUN) message that could remotely execute arbitrary code on the victim’s machine. Users are advised to upgrade as soon as possible. There are no known workarounds.

References

Affected packages

Alpine:v3.16

pjproject

Package

Name
pjproject
Purl
pkg:apk/alpine/pjproject?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.12-r0

Affected versions

1.*

1.0.1-r0
1.4-r0
1.4-r1
1.6-r0
1.6-r1
1.6-r2
1.10-r0

2.*

2.0-r0
2.1-r0
2.2-r0
2.2.1-r0
2.3-r0
2.4-r0
2.4.5-r0
2.5.5-r0
2.5.5-r1
2.5.5-r2
2.5.5-r3
2.5.5-r4
2.7.2-r0
2.7.2-r1
2.7.2-r2
2.7.2-r3
2.7.2-r4
2.8-r0
2.9-r0
2.11-r0
2.11.1-r0
2.11.1-r1
2.11.1-r2

Alpine:v3.17

pjproject

Package

Name
pjproject
Purl
pkg:apk/alpine/pjproject?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.12-r0

Affected versions

1.*

1.0.1-r0
1.4-r0
1.4-r1
1.6-r0
1.6-r1
1.6-r2
1.10-r0

2.*

2.0-r0
2.1-r0
2.2-r0
2.2.1-r0
2.3-r0
2.4-r0
2.4.5-r0
2.5.5-r0
2.5.5-r1
2.5.5-r2
2.5.5-r3
2.5.5-r4
2.7.2-r0
2.7.2-r1
2.7.2-r2
2.7.2-r3
2.7.2-r4
2.8-r0
2.9-r0
2.11-r0
2.11.1-r0
2.11.1-r1
2.11.1-r2

Alpine:v3.18

pjproject

Package

Name
pjproject
Purl
pkg:apk/alpine/pjproject?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.12-r0

Affected versions

1.*

1.0.1-r0
1.4-r0
1.4-r1
1.6-r0
1.6-r1
1.6-r2
1.10-r0

2.*

2.0-r0
2.1-r0
2.2-r0
2.2.1-r0
2.3-r0
2.4-r0
2.4.5-r0
2.5.5-r0
2.5.5-r1
2.5.5-r2
2.5.5-r3
2.5.5-r4
2.7.2-r0
2.7.2-r1
2.7.2-r2
2.7.2-r3
2.7.2-r4
2.8-r0
2.9-r0
2.11-r0
2.11.1-r0
2.11.1-r1
2.11.1-r2

Alpine:v3.19

pjproject

Package

Name
pjproject
Purl
pkg:apk/alpine/pjproject?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.12-r0

Affected versions

1.*

1.0.1-r0
1.4-r0
1.4-r1
1.6-r0
1.6-r1
1.6-r2
1.10-r0

2.*

2.0-r0
2.1-r0
2.2-r0
2.2.1-r0
2.3-r0
2.4-r0
2.4.5-r0
2.5.5-r0
2.5.5-r1
2.5.5-r2
2.5.5-r3
2.5.5-r4
2.7.2-r0
2.7.2-r1
2.7.2-r2
2.7.2-r3
2.7.2-r4
2.8-r0
2.9-r0
2.11-r0
2.11.1-r0
2.11.1-r1
2.11.1-r2

Alpine:v3.20

pjproject

Package

Name
pjproject
Purl
pkg:apk/alpine/pjproject?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.12-r0

Affected versions

1.*

1.0.1-r0
1.4-r0
1.4-r1
1.6-r0
1.6-r1
1.6-r2
1.10-r0

2.*

2.0-r0
2.1-r0
2.2-r0
2.2.1-r0
2.3-r0
2.4-r0
2.4.5-r0
2.5.5-r0
2.5.5-r1
2.5.5-r2
2.5.5-r3
2.5.5-r4
2.7.2-r0
2.7.2-r1
2.7.2-r2
2.7.2-r3
2.7.2-r4
2.8-r0
2.9-r0
2.11-r0
2.11.1-r0
2.11.1-r1
2.11.1-r2

Alpine:v3.21

pjproject

Package

Name
pjproject
Purl
pkg:apk/alpine/pjproject?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.12-r0

Affected versions

1.*

1.0.1-r0
1.4-r0
1.4-r1
1.6-r0
1.6-r1
1.6-r2
1.10-r0

2.*

2.0-r0
2.1-r0
2.2-r0
2.2.1-r0
2.3-r0
2.4-r0
2.4.5-r0
2.5.5-r0
2.5.5-r1
2.5.5-r2
2.5.5-r3
2.5.5-r4
2.7.2-r0
2.7.2-r1
2.7.2-r2
2.7.2-r3
2.7.2-r4
2.8-r0
2.9-r0
2.11-r0
2.11.1-r0
2.11.1-r1
2.11.1-r2

Alpine:v3.22

pjproject

Package

Name
pjproject
Purl
pkg:apk/alpine/pjproject?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.12-r0

Affected versions

1.*

1.0.1-r0
1.4-r0
1.4-r1
1.6-r0
1.6-r1
1.6-r2
1.10-r0

2.*

2.0-r0
2.1-r0
2.2-r0
2.2.1-r0
2.3-r0
2.4-r0
2.4.5-r0
2.5.5-r0
2.5.5-r1
2.5.5-r2
2.5.5-r3
2.5.5-r4
2.7.2-r0
2.7.2-r1
2.7.2-r2
2.7.2-r3
2.7.2-r4
2.8-r0
2.9-r0
2.11-r0
2.11.1-r0
2.11.1-r1
2.11.1-r2

Git

github.com/asterisk/asterisk

Affected ranges

Type
GIT
Repo
https://github.com/asterisk/asterisk
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
d436f568583184a13aa46349af5a3f0907087b44
Type
GIT
Repo
https://github.com/pjsip/pjproject
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
15663e3f37091069b8c98a7fce680dc04bc8e865

Affected versions

16.*

16.8.0-rc1
16.8.0-rc2

2.*

2.10
2.11

Database specific 

{
    "vanir_signatures": [
        {
            "id": "CVE-2021-37706-6c9a95f2",
            "digest": {
                "line_hashes": [
                    "286375471227338908900759340395951320869",
                    "337170165584158815641361604078421931103",
                    "218425442522531084557250897674746904437",
                    "215575948014480304126719586812745130850"
                ],
                "threshold": 0.9
            },
            "signature_type": "Line",
            "deprecated": false,
            "target": {
                "file": "pjnath/src/pjnath/stun_msg.c"
            },
            "signature_version": "v1",
            "source": "https://github.com/pjsip/pjproject/commit/15663e3f37091069b8c98a7fce680dc04bc8e865"
        },
        {
            "id": "CVE-2021-37706-9e426c0f",
            "digest": {
                "length": 452.0,
                "function_hash": "166111760674862860056573304105766004106"
            },
            "signature_type": "Function",
            "deprecated": false,
            "target": {
                "file": "pjnath/src/pjnath/stun_msg.c",
                "function": "decode_errcode_attr"
            },
            "signature_version": "v1",
            "source": "https://github.com/pjsip/pjproject/commit/15663e3f37091069b8c98a7fce680dc04bc8e865"
        }
    ]
}