CVE-2026-8247: An Out-of-bounds Write vulnerability in WatchGuard Fireware OS may allow an unauthenticated attacker on the same local network segment to execute arbitrary code. This vulnerabi

unknownCVE-2026-8247

An Out-of-bounds Write vulnerability in WatchGuard Fireware OS may allow an unauthenticated attacker on the same local network segment to execute arbitrary code. This vulnerability affects Fireware OS 11.0 up to and including 11.12.4_Update1, 12.0 up to and including 12.12 and 2025.1 up to and including 2026.2.

Details

Source: NVD Recent CVEs (US · database · site)
Severity: unknown
Published: 2026-07-03
Last updated: 2026-07-07
Exploitation: Not in CISA KEV at last sync

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-8247

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-82470.20% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 10% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-8247	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

high[NEW] [high] WatchGuard Firebox: Multiple vulnerabilitiescert-bund

Recent advisories for An Out-of-bounds Write

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

highCVE-2026-55233: OpenResty is a high performance web platform. From 1.29.2.1 to before 1.29.2.5, an out-of-boun…nvd · 2026-07-10
highCVE-2026-55687: ESF-IDF is the Espressif Internet of Things (IOT) Development Framework. Versions 6.0.1, 5.5.4…nvd · 2026-07-10
unknownCVE-2026-21057: Improper input validation in Samsung Pass prior to version 5.2.10.3 allows local privileged at…nvd · 2026-07-10
unknownCVE-2026-21049: Out-of-bounds write in libpadm.so library prior to SMR Jul-2026 Release 1 allows local attacke…nvd · 2026-07-10
unknownCVE-2026-21048: Out-of-bounds write in parsing DNG format in libimagecodec.media.quram.so prior to SMR Jul-202…nvd · 2026-07-10
unknownCVE-2026-21045: Out-of-bounds write in parsing TIFF format in libimagecodec.media.quram.so prior to SMR Jul-20…nvd · 2026-07-10