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Fencer Vulns
high 8.8

CVE-2021-26675 json

A stack-based buffer overflow in dnsproxy in ConnMan before 1.39 could be used by network adjacent attackers to execute code.

published 2021-02-09 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-13468

cvss
8.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.4%
EPSS 1.4% chance of exploitation in 30 days, percentile 71%
public exploits
0
none known

Summary

A stack-based buffer overflow in dnsproxy in ConnMan before 1.39 could be used by network adjacent attackers to execute code.

Patch / fix

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

debian advisories DEBIAN-CVE-2021-26675

  • connman Ubuntu 20.04 LTS 1.36-2ubuntu0.1
  • connman Ubuntu Pro 18.04 LTS 1.35-6ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2021-26675

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 3.24, Alpine 3.23, Alpine 3.22 +9 more 1.39-r0

alpine advisories ALPINE-CVE-2021-26675

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-2021-26675 updated cvss 8.8

connman: stack buffer overflow that can be used to execute code by network adjacent attackers

  • 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

1.36% chance of exploitation in the next 30 days, higher than 71% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 8.8 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 5.8 AV:A/AC:L/Au:N/C:P/I:P/A:P

Classification

Weakness

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.