How severe is CVE-2025-11678?

CVE-2025-11678 has a CVSS 4.0 base score of 7.5, rated high severity.

Is CVE-2025-11678 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-11678?

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.

Does CVE-2025-11678 have an EU (EUVD) identifier?

Yes. CVE-2025-11678 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-35057.

When was CVE-2025-11678 published?

CVE-2025-11678 was published on 2025-10-20 and last updated on 2026-06-17.

CVE-2025-11678

CVE-2025-11678 is a high-severity vulnerability with a CVSS 4.0 base score of 7.5. 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-121.

Key facts

Severity: High (CVSS 4.0 base score 7.5)
EPSS exploit prediction: 0% (19th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-35057
Weakness: CWE-121
Published: 2025-10-20
Last modified: 2026-06-17

Description

Stack-based Buffer Overflow in lws_adns_parse_label in warmcat libwebsockets allows, when the LWS_WITH_SYS_ASYNC_DNS flag is enabled during compilation, to overflow the label_stack, when the attacker is able to sniff a DNS request in order to craft a response with a matching id containing a label longer than the maximum.

Frequently asked questions

What is CVE-2025-11678?: Stack-based Buffer Overflow in lws_adns_parse_label in warmcat libwebsockets allows, when the LWS_WITH_SYS_ASYNC_DNS flag is enabled during compilation, to overflow the label_stack, when the attacker is able to sniff a DNS request in order to craft a response with a matching id containing a label longer than the maximum.
How severe is CVE-2025-11678?: CVE-2025-11678 has a CVSS 4.0 base score of 7.5, rated high severity.
Is CVE-2025-11678 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-11678?: 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.
Does CVE-2025-11678 have an EU (EUVD) identifier?: Yes. CVE-2025-11678 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-35057.
When was CVE-2025-11678 published?: CVE-2025-11678 was published on 2025-10-20 and last updated on 2026-06-17.

References

Other CWE-121 (Stack-based Buffer Overflow) vulnerabilities

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