Detections
Analytics

Alpine: multiple syncthing packages: security update to 1.15.1-r0

high Tenable Self-Hosted Container Security Plugin ID 426113

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - 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. (CVE-2021-21404)

See Also

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

Plugin Details

Severity: High

ID: 426113

Version: Revision 1.3

Type: Local

Published: 5/16/2025

Updated: 7/2/2026

Supported Sensors: Agentless Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.18

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS Score Source: CVE-2021-21404

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 4/6/2021

Reference Information

CVE: CVE-2021-21404