Is CVE-2025-11678 in the CISA KEV catalog?

No. CVE-2025-11678 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the EPSS score for CVE-2025-11678?

CVE-2025-11678 has an EPSS score of 0.27% (19th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2025-11678?

Upgrade libwebsockets on debian 11 to 4.0.20-2+deb11u1 or later. Fixes are available for 13 affected products.

CVE & CISA-KEV Catalog

CVE-2025-11678

UNSCORED

NVD

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.

CWE-121Stack-based Buffer Overflow

How to fix

Remediation Available

libwebsocketsDebian

Fixed in:4.0.20-2+deb11u1CVE-2025-11678

Fixed in:4.3.5-1+deb13u1CVE-2025-11678

Fixed in:4.3.5-3CVE-2025-11678

libwebsocketsRed Hat / RHEL

Fixed in:0:4.3.0-2.el9ostRHSA-2025:22969

libwebsocketsRocky

Fixed in:0:4.3.0-2.el9ostRHSA-2025:22969

libwebsockets-debuginfoRocky

Fixed in:0:4.3.0-2.el9ostRHSA-2025:22969

libwebsockets-debuginfoRed Hat / RHEL

Fixed in:0:4.3.0-2.el9ostRHSA-2025:22969

libwebsockets-debugsourceRed Hat / RHEL

Fixed in:0:4.3.0-2.el9ostRHSA-2025:22969

libwebsockets-debugsourceRocky

Fixed in:0:4.3.0-2.el9ostRHSA-2025:22969

libwebsockets-devel-debuginfoRocky

Fixed in:0:4.3.0-2.el9ostRHSA-2025:22969

libwebsockets-devel-debuginfoRed Hat / RHEL

Fixed in:0:4.3.0-2.el9ostRHSA-2025:22969

libwebsocketsUbuntu

Fixed in:3.2.1-3ubuntu0.1~esm1USN-8024-1

Fixed in:4.0.20-2ubuntu1.1USN-8024-1

Fixed in:4.3.3-1.1ubuntu0.1~esm1USN-8024-1

libwebsockets15Ubuntu

Fixed in:3.2.1-3ubuntu0.1~esm1USN-8024-1

libwebsockets16Ubuntu

Fixed in:4.0.20-2ubuntu1.1USN-8024-1

libwebsockets19t64Ubuntu

Fixed in:4.3.3-1.1ubuntu0.1~esm1USN-8024-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3.1 Vector

No CVSS vector data available.

Exploit Intelligence

0.27%probability of exploitation in 30 days

19thpercentile

Low risk: more likely to be exploited than 19% of all known CVEs.

References

Other references2

Related Vulnerabilities

Other CWE-121 (Stack-based Buffer Overflow) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-22457	Critical	9.0	100%	KEV + Ransom	Fix
CVE-2025-0282	Critical	9.0	100%	KEV + Ransom	-
CVE-2021-20038	Critical	9.8	100%	KEV + Ransom	-
CVE-2009-0927	High	8.8	97%	KEV	Fix
CVE-2020-10924	High	8.8	87%	-	-
CVE-2022-20705	Critical	10.0	80%	-	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-10-21.