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Fencer Vulns
medium 6.5

CVE-2021-26676 json

gdhcp in ConnMan before 1.39 could be used by network-adjacent attackers to leak sensitive stack information, allowing further exploitation…

published 2021-02-09 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-13469

cvss
6.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.2%
EPSS 1.2% chance of exploitation in 30 days, percentile 67%
public exploits
0
none known

Summary

gdhcp in ConnMan before 1.39 could be used by network-adjacent attackers to leak sensitive stack information, allowing further exploitation of bugs in gdhcp.

Patch / fix

  • intel connman 1.39
  • connman Debian 14, Debian 13, Debian 12 1.36-2.1

debian advisories DEBIAN-CVE-2021-26676

  • connman Ubuntu 20.04 LTS 1.36-2ubuntu0.1
  • connman Ubuntu Pro 16.04 LTS 1.21-1.2+deb8u1ubuntu0.1~esm1
  • connman Ubuntu Pro 18.04 LTS 1.35-6ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2021-26676

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

  • connman openSUSE Tumbleweed 1.40-2.2
  • connman Package Hub 15 SP2 1.39-bp152.4.3.1
  • connman openSUSE Leap 15.2 1.39-lp152.3.3.1

opensuse advisories openSUSE-SU-2024:10692-1openSUSE-SU-2021:0452-1openSUSE-SU-2021:0416-1

  • connman Alpine 3.13 1.38-r4
  • connman Alpine 3.24, Alpine 3.23, Alpine 3.22 +8 more 1.39-r0

alpine advisories ALPINE-CVE-2021-26676

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

  • connman Arch Linux 1.39-1

arch linux advisories AVG-1543

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-2021-26676 updated cvss 6.5

connman: remote stack information leak

  • 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

1.18% chance of exploitation in the next 30 days, higher than 67% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 6.5 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 3.3 AV:A/AC:L/Au:N/C:P/I:N/A:N

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.