DEBIAN-CVE-2021-21404

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Source
https://security-tracker.debian.org/tracker/CVE-2021-21404
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2021-21404.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2021-21404
Upstream
Published
2021-04-06T20:15:13.490Z
Modified
2025-11-19T01:04:39.612633Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
[none]
Details

Syncthing is a continuous file synchronization program. In Syncthing before version 1.15.0, the relay server strelaysrv can be caused to crash and exit by sending a relay message with a negative length field. Similarly, Syncthing itself can crash for the same reason if given a malformed message from a malicious relay server when attempting to join the relay. Relay joins are essentially random (from a subset of low latency relays) and Syncthing will by default restart when crashing, at which point it's likely to pick another non-malicious relay. This flaw is fixed in version 1.15.0.

References

Affected packages

Debian:11 / syncthing

Package

Name
syncthing
Purl
pkg:deb/debian/syncthing?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.12.1~ds1-3

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Debian:12 / syncthing

Package

Name
syncthing
Purl
pkg:deb/debian/syncthing?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.12.1~ds1-3

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Debian:13 / syncthing

Package

Name
syncthing
Purl
pkg:deb/debian/syncthing?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.12.1~ds1-3

Ecosystem specific 

{
    "urgency": "not yet assigned"
}