CVE-2021-21404

See a problem?
Please try reporting it to the source first.
Source
https://cve.org/CVERecord?id=CVE-2021-21404
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-21404.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2021-21404
Aliases
Downstream
DEBIAN (1)
openSUSE (3)
UBUNTU (1)
Related
openSUSE (3)
Published
2021-04-06T20:15:13Z
Modified
2026-10-20T10:54:28Z
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

Git / github.com/syncthing/syncthing

Affected ranges

Type
GIT
Repo
https://github.com/syncthing/syncthing
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
fb4fdaf4c0a79c22cad000c42ac1394e3ccb6a97
Database specific
Show details 
{
    "extracted_events":  [
        {
            "cpe":  "cpe:2.3:a:syncthing:syncthing:*:*:*:*:*:*:*:*",
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "fixed":  "1.15.0"
                }
            ],
            "source":  "CPE_RANGE"
        },
        {
            "range":  [
                {
                    "fixed":  "fb4fdaf4c0a79c22cad000c42ac1394e3ccb6a97"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "original_tag":  "v1.15.0",
            "range":  [
                {
                    "fixed":  "fb4fdaf4c0a79c22cad000c42ac1394e3ccb6a97"
                }
            ],
            "source":  "REFERENCES_TAG"
        }
    ]
}

Affected versions

v0.*
v0.1
v0.10.0
v0.10.0-beta1
v0.10.1
v0.10.10
v0.10.11
v0.10.12
v0.10.13
v0.10.14
v0.10.15
v0.10.16
v0.10.17
v0.10.18
v0.10.19
v0.10.2
v0.10.20
v0.10.21
v0.10.22
v0.10.23
v0.10.24
v0.10.25
v0.10.26
v0.10.27
v0.10.3
v0.10.4
v0.10.5
v0.10.6
v0.10.7
v0.10.8
v0.10.9
v0.11.0
v0.11.0-beta0
v0.11.0-beta1
v0.11.0-beta2
v0.11.0-beta3
v0.11.0-beta4
v0.11.0-beta5
v0.11.0-beta6
v0.11.0-rc0
v0.11.0-rc1
v0.11.1
v0.11.10
v0.11.11
v0.11.12
v0.11.13
v0.11.14
v0.11.15
v0.11.16
v0.11.17
v0.11.18
v0.11.2
v0.11.20
v0.11.3
v0.11.4
v0.11.5
v0.11.6
v0.11.7
v0.11.8
v0.11.9
v0.12.0
v0.12.0-beta0
v0.12.0-beta1
v0.12.0-beta2
v0.12.0-beta3
v0.12.0-beta4
v0.12.0-rc1
v0.12.0-rc2
v0.12.0-rc3
v0.12.0-rc4
v0.12.0-rc5
v0.12.0-rc6
v0.12.1
v0.12.10
v0.12.11
v0.12.2
v0.12.3
v0.12.4
v0.12.5
v0.12.6
v0.12.7
v0.12.8
v0.12.9
v0.13.0
v0.13.0-beta.0
v0.13.0-beta.1
v0.13.0-beta.2
v0.13.0-beta.3
v0.13.0-beta.4
v0.13.1
v0.13.10
v0.13.2
v0.13.3
v0.13.4
v0.13.5
v0.13.6
v0.13.7
v0.13.8
v0.13.9
v0.14.0
v0.14.0-beta.0
v0.14.0-beta.1
v0.14.0-rc.1
v0.14.1
v0.14.10
v0.14.11
v0.14.12
v0.14.13
v0.14.14
v0.14.17
v0.14.18
v0.14.19
v0.14.2
v0.14.20
v0.14.21
v0.14.22
v0.14.22-rc.1
v0.14.24
v0.14.24-rc.1
v0.14.25
v0.14.25-rc.1
v0.14.25-rc.2
v0.14.26
v0.14.26-rc.1
v0.14.27-rc.1
v0.14.27-rc.2
v0.14.28-rc.1
v0.14.29
v0.14.29-rc.1
v0.14.3
v0.14.30
v0.14.30-rc.1
v0.14.31
v0.14.31-rc.1
v0.14.32
v0.14.32-rc.1
v0.14.32-rc.2
v0.14.33
v0.14.33-rc.1
v0.14.34-rc.1
v0.14.35
v0.14.36
v0.14.37
v0.14.37-rc.1
v0.14.37-rc.2
v0.14.37-rc.3
v0.14.38
v0.14.38-rc.1
v0.14.39
v0.14.39-rc.1
v0.14.4
v0.14.40-rc.1
v0.14.41-rc.1
v0.14.41-rc.2
v0.14.42
v0.14.42-rc.1
v0.14.43
v0.14.43-rc.1
v0.14.44-rc.1
v0.14.44-rc.2
v0.14.45
v0.14.45-rc.1
v0.14.45-rc.2
v0.14.45-rc.3
v0.14.46-rc.1
v0.14.47-rc.1
v0.14.48-rc.1
v0.14.48-rc.2
v0.14.48-rc.3
v0.14.49
v0.14.49-rc.1
v0.14.49-rc.2
v0.14.49-rc.4
v0.14.5
v0.14.50-rc.1
v0.14.51-rc.1
v0.14.51-rc.2
v0.14.51-rc.3
v0.14.52
v0.14.52-rc.1
v0.14.52-rc.3
v0.14.53
v0.14.53-rc.1
v0.14.55-rc.1
v0.14.55-rc.2
v0.14.6
v0.14.7
v0.14.8
v0.14.9
v0.2
v0.2.1
v0.2.2
v0.3.0
v0.3.1
v0.3.2
v0.3.3
v0.4.0
v0.4.1
v0.4.2
v0.4.3
v0.5.0
v0.5.1
v0.5.2
v0.5.3
v0.5.4
v0.6.0
v0.6.2
v0.6.3
v0.6.4
v0.6.5
v0.6.6
v0.7.0
v0.7.1
v0.7.2
v0.8.0
v0.8.1
v0.8.10
v0.8.11
v0.8.12
v0.8.13
v0.8.14
v0.8.15
v0.8.16
v0.8.2
v0.8.3
v0.8.4
v0.8.5
v0.8.6
v0.8.7
v0.8.8
v0.8.9
v0.9.0
v0.9.0-beta1
v0.9.0-beta2
v0.9.0-beta3
v0.9.0-beta4
v0.9.0-beta5
v0.9.0-beta6
v0.9.0-beta7
v0.9.0-beta8
v0.9.0-beta9
v0.9.1
v0.9.10
v0.9.11
v0.9.13
v0.9.14
v0.9.15
v0.9.16
v0.9.17
v0.9.18
v0.9.2
v0.9.5
v0.9.6
v0.9.7
v0.9.8
v0.9.9
v1.*
v1.0.1
v1.0.1-rc.1
v1.0.1-rc.2
v1.1.0-rc.1
v1.1.1-rc.1
v1.1.2-rc.1
v1.1.4
v1.1.4-rc.1
v1.10.0
v1.10.0-rc.1
v1.10.0-rc.2
v1.10.0-rc.3
v1.11.0
v1.11.0-rc.1
v1.11.0-rc.2
v1.11.0-rc.3
v1.12.0-rc.1
v1.12.1
v1.12.1-rc.1
v1.13.0
v1.13.0-rc.1
v1.13.1
v1.14.0-rc.1
v1.15.0-rc.1
v1.15.0-rc.2
v1.15.0-rc.3
v1.15.0-rc.4
v1.15.0-rc.5
v1.15.0-rc.6
v1.2.0-rc.1
v1.2.0-rc.2
v1.2.0-rc.3
v1.2.1-rc.1
v1.2.1-rc.2
v1.2.1-rc.3
v1.2.1-rc.4
v1.2.2
v1.2.2-rc.1
v1.2.2-rc.2
v1.2.2-rc.3
v1.3.0-rc.1
v1.3.1
v1.3.1-rc.1
v1.3.1-rc.2
v1.3.2-rc.1
v1.3.3
v1.3.3-rc.1
v1.3.4
v1.3.4-rc.1
v1.4.0-rc.1
v1.4.0-rc.2
v1.4.0-rc.3
v1.4.0-rc.4
v1.4.0-rc.5
v1.4.1-rc.1
v1.5.0-rc.1
v1.6.0-rc.1
v1.7.0
v1.7.0-rc.1
v1.8.0-rc.1
v1.8.0-rc.2
v1.9.0-rc.1
v1.9.0-rc.2
v1.9.0-rc.3
v1.9.0-rc.4

Database specific

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