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Fencer Vulns
medium 6.5

CVE-2019-9917 json

ZNC before 1.7.3-rc1 allows an existing remote user to cause a Denial of Service (crash) via invalid encoding.

published 2019-03-27 7 y ago modified 2026-06-17 4 mo ago also EUVD-2019-19272

cvss
6.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.1%
EPSS 3.1% chance of exploitation in 30 days, percentile 87%
public exploits
0
none known

Summary

ZNC before 1.7.3-rc1 allows an existing remote user to cause a Denial of Service (crash) via invalid encoding.

Patch / fix

  • znc Debian 14, Debian 13, Debian 12 1.7.2-2

debian advisories DEBIAN-CVE-2019-9917

  • znc openSUSE Tumbleweed 1.8.2-1.11
  • znc Package Hub 15 SP1 1.7.4-bp151.4.3.1
  • znc Package Hub 15, openSUSE Leap 15.1, openSUSE Leap 15.0 1.7.4-bp150.2.6.1
  • znc Package Hub 15, Package Hub 12 SP2, Package Hub 12 +1 more 1.7.2-bp150.2.3.1

opensuse advisories openSUSE-SU-2024:11542-1openSUSE-SU-2019:1859-1openSUSE-SU-2019:1775-1openSUSE-SU-2019:1166-1

  • znc Alpine 3.24, Alpine 3.23, Alpine 3.22 +12 more 1.7.3-r0
  • znc Alpine 3.8, Alpine 3.7 1.7.1-r1
  • znc Alpine 3.9 1.7.1-r3

alpine advisories ALPINE-CVE-2019-9917

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2019-9917 updated cvss 7.5

znc: crash on invalid encoding

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

3.08% chance of exploitation in the next 30 days, higher than 87% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 6.5 CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 4.0 AV:N/AC:L/Au:S/C:N/I:N/A:P

Classification

Weakness
  • CWE-20 Improper Input Validation

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.