CVE-2021-26675 [High] | Out-of-bounds Write in Connman

CVE-2021-26675 is rated Moderate Risk (49.3/100): CVSS High severity, with low exploitation likelihood (EPSS 0.19%). Review affected assets and schedule remediation.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2025-12-28	0.29%	0.19%	-0.10%
2	2025-12-27	0.19%	0.29%	+0.10%
3	2025-11-21	—	0.19%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2025-12-28

0.29%

0.19%

-0.10%

2025-12-27

0.19%

0.29%

+0.10%

2025-11-21

—

0.19%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
8.8	3.1	HIGH	`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H` 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:H) They could widely tamper with or forge data—trust in the data is badly hurt. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	2.8	5.9	[email protected]
5.8	2.0	MEDIUM	`AV:A/AC:L/Au:N/C:P/I:P/A:P` 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:P) Partial integrity impact. Availability impact (A:P) Partial availability impact.	6.5	6.4	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

8.8

3.1

HIGH

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H 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:H): They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

2.8

5.9

[email protected]

5.8

2.0

MEDIUM

AV:A/AC:L/Au:N/C:P/I:P/A:P 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:P): Partial integrity impact.
Availability impact (A:P): Partial availability impact.

6.5

6.4

[email protected]

OS Trackers for CVE-2021-26675

vendor	priority	summary	link
`alpine`	high	CVE-2021-26675: 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-2021-26675
`debian`	not yet assigned	CVE-2021-26675 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-2021-26675
`gentoo`	normal	CVE-2021-26675: 1 GLSA(s) (202107-29), 1 atom(s) (net-misc/connman); latest impact normal.	https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2021-26675
`ubuntu`	medium	CVE-2021-26675 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): not-affected 4, ignored 3, released 3, DNE 1.	https://ubuntu.com/security/CVE-2021-26675

Affected software / configurations for CVE-2021-26675

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-2021-26675

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=e4079a20f617a4b076af503f6e4e8b0304c9f2cb	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/	Technical Description 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

URL

CVE-2021-26675

Exploit prediction scoring system (EPSS) score for CVE-2021-26675

Common vulnerability scoring system (CVSS) metrics for CVE-2021-26675

Weakness enumeration for CVE-2021-26675

OS Trackers for CVE-2021-26675

Affected software / configurations for CVE-2021-26675

References for CVE-2021-26675