CVE-2021-26676

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.

Published: 2021-02-09 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-26676 is rated Moderate Risk (49.7/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.21%). EPSS rose +1.12% over the last day, indicating growing attacker interest. Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2021-26676

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.10% 1.21% +1.12%
2 2025-11-21 0.27% 0.10% -0.18%
3 2025-11-18 — 0.27% —

Full EPSS history (12 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-26676

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.5 3.1 MEDIUM
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Click to expand
Attack vector (AV:A)
Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 2.8 3.6 [email protected]
3.3 2.0 LOW
AV:A/AC:L/Au:N/C:P/I:N/A:N Click to expand
Access vector (AV:A)
Requires access to an adjacent network segment.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 6.5 2.9 [email protected]

Weakness enumeration for CVE-2021-26676

OS Trackers for CVE-2021-26676

vendor priority summary link
alpine medium CVE-2021-26676: 1 source package rows (connman); 7 state rows across 7 repos (3.17-community, 3.18-community, 3.19-community, 3.20-community, 3.21-community, 3.22-community, edge-community); fixed 7, open 0. https://security.alpinelinux.org/vuln/CVE-2021-26676
debian not yet assigned CVE-2021-26676 not yet assigned priority: Debian including 1 source packages (connman), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2021-26676
gentoo normal CVE-2021-26676: 1 GLSA(s) (202107-29), 1 atom(s) (net-misc/connman); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2021-26676
ubuntu medium CVE-2021-26676 medium priority: Ubuntu including 1 source packages (connman), 11 status rows across 11 suites (bionic, focal, groovy, hirsute, impish, jammy, kinetic, lunar, trusty, upstream, xenial): released 4, ignored 3, not-affected 3, DNE 1. https://ubuntu.com/security/CVE-2021-26676

Affected software / configurations for CVE-2021-26676

Vendor Product Version Raw CPE
intel connman < 1.39 cpe:2.3:a:intel:connman:*:*:*:*:*:*:*:*
debian debian_linux 9.0 cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
debian debian_linux 10.0 cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
opensuse leap 15.2 cpe:2.3:o:opensuse:leap:15.2:*:*:*:*:*:*:*

References for CVE-2021-26676

URL Tags
https://bugzilla.suse.com/show_bug.cgi?id=1181751 Issue Tracking Third Party Advisory
https://git.kernel.org/pub/scm/network/connman/connman.git/commit/?id=58d397ba74873384aee449690a9070bacd5676fa Patch Third Party Advisory
https://git.kernel.org/pub/scm/network/connman/connman.git/commit/?id=a74524b3e3fad81b0fd1084ffdf9f2ea469cd9b1 Patch Third Party Advisory
https://git.kernel.org/pub/scm/network/connman/connman.git/tree/ChangeLog Release Notes Third Party Advisory
https://kunnamon.io/tbone/ Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/02/msg00013.html Mailing List Third Party Advisory
https://security.gentoo.org/glsa/202107-29 Third Party Advisory
https://www.debian.org/security/2021/dsa-4847 Third Party Advisory
https://www.openwall.com/lists/oss-security/2021/02/08/2 Mailing List Third Party Advisory
cvelogic Threat Intelligence