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Fencer Vulns
medium 5.9

CVE-2019-5163 json

An exploitable denial-of-service vulnerability exists in the UDPRelay functionality of Shadowsocks-libev 3.3.2.

published 2019-12-03 6 y ago modified 2026-06-17 4 mo ago also EUVD-2019-14768

cvss
5.9
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
2.7%
EPSS 2.7% chance of exploitation in 30 days, percentile 85%
public exploits
0
none known

Summary

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.

Patch / fix

  • shadowsocks-libev Debian 13, Debian 12 3.3.3+ds-2

debian advisories DEBIAN-CVE-2019-5163

  • shadowsocks-libev openSUSE Tumbleweed 3.3.5-1.9
  • shadowsocks-libev Package Hub 15 SP1 3.3.3-bp151.5.3.1
  • shadowsocks-libev openSUSE Leap 15.1 3.3.3-lp151.2.3.1

opensuse advisories openSUSE-SU-2024:11379-1openSUSE-SU-2020:0142-1openSUSE-SU-2019:2667-1

Exploit prediction

2.66% chance of exploitation in the next 30 days, higher than 85% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • talosintelligence.com https://talosintelligence.com/vulnerability_reports/TALOS-2019-0956 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.0 5.9 CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:N/A:P

Affected products

  • n/a Shadowsocks

Classification

Weakness
  • CWE-306 Missing Authentication for Critical Functionality

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.