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Fencer Intel
medium 5.3

CVE-2025-2173 json

libzvbi conv.c vbi_strndup_iconv_ucs2 uninitialized pointer

published last yr. modified 4mo ago also EUVD-2025-7526

cvss
5.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 49%
public exploits
0
none known

Summary

A vulnerability was found in libzvbi up to 0.2.43. It has been classified as problematic. Affected is the function vbi_strndup_iconv_ucs2 of the file src/conv.c. The manipulation of the argument src_length leads to uninitialized pointer. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used. Upgrading to version 0.2.44 is able to address this issue. The patch is identified as 8def647eea27f7fd7ad33ff79c2d6d3e39948dce. It is recommended to upgrade the affected component. The code maintainer was informed beforehand about the issues. She reacted very fast and highly professional.

Patch / fix

  • zapping-vbi zvbi 0.2.44
  • zvbi Debian 12 0.2.41-1+deb12u1
  • zvbi Debian 14, Debian 13 0.2.44-1

debian advisories DEBIAN-CVE-2025-2173

  • zvbi Ubuntu Pro 16.04 LTS 0.2.35-10ubuntu0.1~esm1
  • zvbi Ubuntu Pro 18.04 LTS 0.2.35-13ubuntu0.1~esm1
  • zvbi Ubuntu Pro 20.04 LTS 0.2.35-17ubuntu0.1~esm1
  • zvbi Ubuntu Pro 22.04 LTS 0.2.35-19ubuntu0.1~esm1
  • zvbi Ubuntu Pro 24.04 LTS 0.2.42-2ubuntu0.24.04.1~esm1

ubuntu advisories UBUNTU-CVE-2025-2173

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • zvbi SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +8 more 0.2.35-150000.4.3.1
  • zvbi SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 0.2.35-3.3.1

suse advisories SUSE-SU-2025:0988-1SUSE-SU-2025:0979-1

  • zvbi openSUSE Tumbleweed 0.2.44-1.1

opensuse advisories openSUSE-SU-2025:14891-1

Is CVE-2025-2173 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
last yr.

Exploit prediction

0.62% chance of exploitation in the next 30 days, higher than 49% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 4.0 6.9 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
CNA 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CNA 3.0 5.3 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CNA 2.0 5.0 AV:N/AC:L/Au:N/C:P/I:N/A:N
CNA 4.0 6.9 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • n/a libzvbi

Classification

Weakness
  • CWE-824 Access of Uninitialized Pointer
  • CWE-908 Use of Uninitialized Resource

References

Sources

Fencer Intel 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.