How severe is CVE-2021-26675?

CVE-2021-26675 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-26675 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (67th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-26675?

CVE-2021-26675 primarily affects Intel Connman. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-26675?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-26675 published?

CVE-2021-26675 was published on 2021-02-09 and last updated on 2026-06-17.

CVE-2021-26675

CVE-2021-26675 is a high-severity vulnerability in Intel Connman with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-787.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 5.8
EPSS exploit prediction: 1% (67th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-787
Affected product: Intel Connman
Published: 2021-02-09
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is CVE-2021-26675?: A stack-based buffer overflow in dnsproxy in ConnMan before 1.39 could be used by network adjacent attackers to execute code.
How severe is CVE-2021-26675?: CVE-2021-26675 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-26675 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (67th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-26675?: CVE-2021-26675 primarily affects Intel Connman. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-26675?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-26675 published?: CVE-2021-26675 was published on 2021-02-09 and last updated on 2026-06-17.

References

Affected products (4)

cpe:2.3:a:intel:connman:*:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
cpe:2.3:o:opensuse:leap:15.2:*:*:*:*:*:*:*

More vulnerabilities in Intel Connman

CVE-2022-32292 — Critical (CVSS 9.8): In ConnMan through 1.41, remote attackers able to send HTTP requests to the gweb component are able to exploit a…
CVE-2017-12865 — Critical (CVSS 9.8): Stack-based buffer overflow in "dnsproxy.c" in connman 1.34 and earlier allows remote attackers to cause a denial of…
CVE-2022-23097 — Critical (CVSS 9.1): An issue was discovered in the DNS proxy in Connman through 1.40. forward_dns_reply mishandles a strnlen call, leading…
CVE-2022-23096 — Critical (CVSS 9.1): An issue was discovered in the DNS proxy in Connman through 1.40. The TCP server reply implementation lacks a check for…
CVE-2022-32293 — High (CVSS 8.1): In ConnMan through 1.41, a man-in-the-middle attack against a WISPR HTTP query could be used to trigger a…
CVE-2022-23098 — High (CVSS 7.5): An issue was discovered in the DNS proxy in Connman through 1.40. The TCP server reply implementation has an infinite…

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