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Vulnerability record · CVE-2026-78011 · published 28 August 2026

CVE-2026-78011: Out-of-bounds write vulnerability

An integer underflow vulnerability in the WatchGuard Fireware OS iked process allows a remote unauthenticated attacker to create a Denial of Service (DoS) condition in VPN processing by sending specially crafted network traffic.

8.7 CVSS 4.0 High EPSS 0.54% · top 56.6% CWE-191 · CWE-191CWE-787 · Out-of-bounds write Deferred
8.7CVSS 4.0 base score
0.54%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
1References
3 Sep 2026Last modified by NVD

Description

An integer underflow vulnerability in the WatchGuard Fireware OS iked process allows a remote unauthenticated attacker to create a Denial of Service (DoS) condition in VPN processing by sending specially crafted network traffic.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://psirt.watchguard.com/CVE-2026-78011

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2014-0497Adobe Flash Player integer underflow allows remote code executionAdobe Flash Player contains an integer underflow (CWE-191) that allows remote attackers to execute arbitrary code via unspecified vectors. The flaw a…KEVEPSS 100%analysed8.4CVE-2022-0185Linux Kernel Filesystem Context Heap Buffer OverflowThe legacy_parse_param function in the Linux kernel's Filesystem Context functionality fails to properly verify supplied parameter lengths, causing a…KEVEPSS 25%analysed7.8CVE-2021-31956Windows NTFS integer underflow privilege escalationCVE-2021-31956 is an elevation of privilege flaw in the Windows NTFS file system driver, rooted in an integer underflow (CWE-191). A local attacker w…KEVEPSS 22%analysed

Source: NIST National Vulnerability Database (record CVE-2026-78011), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.