ALPINE-CVE-2021-21404

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Source

https://security.alpinelinux.org/vuln/CVE-2021-21404

Import Source

https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-21404.json

JSON Data

https://api.osv.dev/v1/vulns/ALPINE-CVE-2021-21404

Upstream

CVE-2021-21404

Published

2021-04-06T20:15:13Z

Modified

2026-11-03T06:32:31Z

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

https://security.alpinelinux.org/vuln/CVE-2021-21404

Affected packages

Alpine:v3.13

syncthing

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

1.12.1-r1

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-21404.json"

Alpine:v3.14

syncthing

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

1.15.1-r0

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-21404.json"

Alpine:v3.15

syncthing

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

1.15.1-r0

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-21404.json"

Alpine:v3.16

syncthing

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

1.15.1-r0

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-21404.json"

Alpine:v3.17

syncthing

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

1.15.1-r0

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-21404.json"

Alpine:v3.18

syncthing

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

1.15.1-r0

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-21404.json"

Alpine:v3.19

syncthing

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

1.15.1-r0

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-21404.json"

Alpine:v3.20

syncthing

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

1.15.1-r0

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-21404.json"

Alpine:v3.21

syncthing

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

1.15.1-r0

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-21404.json"

Alpine:v3.22

syncthing

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

1.15.1-r0

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-21404.json"

Alpine:v3.23

syncthing

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

1.15.1-r0

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-21404.json"

Alpine:v3.24

syncthing

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

1.15.1-r0

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-21404.json"