F5 BIG-IP: Schwachstelle ermöglicht Denial of Service
WID-SEC-2026-0451 · first 19.02.2026 · updated 19.02.2026 · CVSS 7,5
What it is about
F5 FirePass ist ein SSL-VPN Gateway der F5 Corporation. Die BIG-IP ist eine Netzwerk Appliance auf der die meisten F5 Produkte laufen. Ein entfernter, anonymer Angreifer kann eine Schwachstelle in F5 BIG-IP ausnutzen, um einen Denial of Service Angriff durchzuführen.
Under what conditions?
Over the network and without logging in. This is the most dangerous combination: attackers can scan reachable devices automatically.
What can happen in the worst case
An attacker could use the vulnerability to
- einen Denial of Service Angriff durchzuführen
Am I affected?
Affected according to the BSI:
- F5 BIG-IP AFM <Hotfix-BIGIP-17.5.1.4.0.17.20
- F5 BIG-IP DDoS Hybrid Defender <Hotfix-BIGIP-17.5.1.4.0.17.20
The installed version is usually shown under “Help → About” or in the device’s admin interface.
What helps?
Update to at least:
- F5 BIG-IP AFM Hotfix-BIGIP-17.5.1.4.0.17.20
- F5 BIG-IP DDoS Hybrid Defender Hotfix-BIGIP-17.5.1.4.0.17.20
Is the vulnerability already being exploited?
None of the CVEs is in the CISA catalogue of exploited vulnerabilities. That does not mean there are no attacks, only that none are documented.
Information and sources
- Original BSI advisory (WID)
- F5 Security Advisory vom 2026-02-18 my.f5.com
- CVERecord vom 2026-02-18 www.cve.org
CVE: CVE-2026-2507
Source: BSI warning and information service (CERT-Bund); CISA. The assessment of the conditions is my reading of the BSI text; the external pages are in their original language.