Cisco IOS XE: Mehrere Schwachstellen
WID-SEC-2026-2674 · first 06.08.2026 · updated 06.08.2026 · CVSS 9,8
What it is about
Cisco Internetwork Operating System (IOS) ist ein Betriebssystem, das für Cisco Geräte wie z. B. Router und Switches eingesetzt wird. Ein Angreifer kann mehrere Schwachstellen in Cisco IOS XE ausnutzen, um beliebigen Code auszuführen, Sicherheitsmaßnahmen zu umgehen, vertrauliche Informationen offenzulegen, Daten zu manipulieren oder einen Denial-of-Service-Zustand herbeizuführen.
Under what conditions?
The BSI does not name any particular preconditions. Exploitable remotely according to the BSI.
What can happen in the worst case
An attacker could use the vulnerability to
- beliebigen Code auszuführen
- Sicherheitsmaßnahmen zu umgehen
- vertrauliche Informationen offenzulegen
- Daten zu manipulieren oder einen Denial-of-Service-Zustand herbeizuführen
Am I affected?
Affected according to the BSI:
- Cisco IOS XE
- Cisco IOS XE <17.9.10
- Cisco IOS XE <17.12.8
- Cisco IOS XE <17.15.6
- Cisco IOS XE <17.18.4
- Cisco IOS XE <17.18.4a
- Cisco IOS XE <26.1.2
The installed version is usually shown under “Help → About” or in the device’s admin interface.
What helps?
Update to at least:
- Cisco IOS XE 17.9.10
- Cisco IOS XE 17.12.8
- Cisco IOS XE 17.15.6
- Cisco IOS XE 17.18.4
- Cisco IOS XE 17.18.4a
- Cisco IOS XE 26.1.2
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)
- Cisco Security Advisory cisco-sa-webui-dos-qdc7qx3 vom 2026-08-05 sec.cloudapps.cisco.com
- Cisco Security Advisory cisco-sa-xe-webui-dos-PtAODAWW vom 2026-08-05 sec.cloudapps.cisco.com
- Cisco Security Advisory cisco-sa-iosxe-snmp-dos-ZAqNm4MD vom 2026-08-05 sec.cloudapps.cisco.com
- Cisco Security Advisory cisco-sa-iosxe-bing-MGHrFAkd vom 2026-08-05 sec.cloudapps.cisco.com
- Cisco Security Advisory cisco-sa-hardening-iosxe-V8NMuMZJ vom 2026-08-05 sec.cloudapps.cisco.com
CVE: CVE-2026-20267, CVE-2026-20268, CVE-2026-20269, CVE-2026-20270, CVE-2026-20271, CVE-2026-20272, CVE-2026-20273, CVE-2026-20308, CVE-2026-20311, CVE-2026-20124, CVE-2026-20263
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.