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No exploitation reportedFix available

CVE-2019-5163

No exploitation reported by the sources we read.

  • Published2019-12-03
  • WeaknessCWE-306

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

An exploitable denial-of-service vulnerability exists in the UDPRelay functionality of Shadowsocks-libev 3.3.2. When utilizing a Stream Cipher and a local_address, arbitrary UDP packets can cause a FATAL error code path and exit. An attacker can send arbitrary UDP packets to trigger this vulnerability.

Timeline

dates in UTC
  1. 2019-12-0322:15CVE publishedNVD

Versions per branch

NVD
Opensuse backports
BranchAffectedFixed in
—= sle-15no fix published
Opensuse leap
BranchAffectedFixed in
15.1= 15.1no fix published
Shadowsocks shadowsocks-libev
BranchAffectedFixed in
3.3= 3.3.2no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • shadowsocks-libevUbuntu:18.04:LTSall versions · no fixed version listed
  • shadowsocks-libevSUSE:Package Hub 15 SP1all versions · fixed in 3.3.3-bp151.5.3.1
  • shadowsocks-libevopenSUSE:Tumbleweedall versions · fixed in 3.3.5-1.9
  • shadowsocks-libevopenSUSE:Leap 15.1all versions · fixed in 3.3.3-lp151.2.3.1
  • shadowsocks-libevMageia:7all versions · fixed in 3.3.3-1.mga7
  • shadowsocks-libevDebian:13all versions · fixed in 3.3.3+ds-2
  • shadowsocks-libevDebian:12all versions · fixed in 3.3.3+ds-2
  • shadowsocks-libevCleanStartall versions · fixed in 3.3.4-r0

Full record on NVD

Fix

No fix published by the sources we read yet. NVD record

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVSS 3.17.5read 2026-10-23
  • CNACVSS 3.05.9known since 2026-10-23
  • NVDCVSS 2.04.3read 2026-10-23
  • CNAweakness (CWE)CWE-306known since 2026-10-23
  • NVDweakness (CWE)CWE-306read 2026-10-23
  • FIRST EPSSEPSS score2.7 %2026-11-09
  • OSVaffected packages—
  • GitHub Advisoriesadvisory—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2019-12-03
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-vc3w-rpc8-4w8g

Frequently asked questions

What is CVE-2019-5163?

An exploitable denial-of-service vulnerability exists in the UDPRelay functionality of Shadowsocks-libev 3.3.2. When utilizing a Stream Cipher and a local_address, arbitrary UDP packets can cause a FATAL error code path and exit. An attacker can send arbitrary UDP packets to trigger this vulnerability.

Is CVE-2019-5163 actively exploited?

Active exploitation of CVE-2019-5163 has not been confirmed. Its EPSS score was 2.7% on 2026-11-09, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2019-5163?

CVE-2019-5163 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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