Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability
May 2026: This security advisory provides the details and fix information for a vulnerability that was discovered and fixed after the was disclosed in February 2026. This new advisory is for a new vulnerability in the control connection…
Schweregrad = CVSS. Wahrscheinlichkeit = EPSS (FIRST). Ausnutzung = öffentliche Signale: KEV, EUVD, Ransomware, EPSS über 10 %, ohne Konto.
Ausnutzungswahrscheinlichkeit EPSS · FIRST
Ausnutzungssignale 4 / 5
- KEV-Katalog (CISA)14.05.2026
- In der EUVD ausgenutzt (ENISA)14.05.2026
- Von Ransomware genutztnein
- EPSS über 10 %91,8 %
- Ohne Konto, über das Netzja
Was tun
Beheben
Den Patch des Herstellers einspielen, sobald er verfügbar ist.
Vorgabe der CISA: Please adhere to CISA’s guidelines to assess exposure and mitigate risks associated with Cisco SD-WAN devices as outlined in CISA’s Emergency Directive 26-03 (URL listed below in Notes) and CISA’s Hunt & Hardening Guidance for Cisco SD-WAN Devices (URL listed below in Notes). Adhere to the applicable BOD 22-01 guidance for cloud services or discontinue use of the product if mitigations are not available.
Bis dahin
Den Dienst vom Internet nehmen oder den Zugriff einschränken, Protokolle überwachen und nach Kompromittierungsspuren suchen.
Hersteller (CRA)
Ausgenutzte Schwachstelle in Ihrem Produkt: Frühwarnung an die ENISA binnen 24 h, dann Meldung binnen 72 h (Artikel 14 des Cyber Resilience Act). Der CRA erklärt
Beschreibung ENISA EUVD
May 2026: This security advisory provides the details and fix information for a vulnerability that was discovered and fixed after the was disclosed in February 2026. This new advisory is for a new vulnerability in the control connection handshaking. The section of this advisory includes Show Control Connections guidance to help with system checks. A vulnerability in the peering authentication in Cisco Catalyst SD-WAN Controller, formerly SD-WAN vSmart, Cisco Catalyst SD-WAN Manager, formerly SD-WAN vManage, and Cisco Catalyst SD-WAN Validator, formerly SD-WAN vBond, could allow an unauthenticated, remote attacker to bypass authentication and obtain administrative privileges on an affected system. This vulnerability exists because the peering authentication mechanism in an affected system is not working properly. An attacker could exploit this vulnerability by sending crafted requests to the affected system. A successful exploit could allow the attacker to log in to an affected Cisco Catalyst SD-WAN Controller as an internal, high-privileged, non-root user account. Using this account, the attacker could access NETCONF, which would then allow the attacker to manipulate network configuration for the SD-WAN fabric.
Text der Quelle, auf Englisch.
Betroffene Produkte
- 18.3.3
- 20.9.5
- 20.12.3.1
- 18.4.501_ES
- 20.15.3
- 19.0.0
- 20.12.3
- 19.2.1
- 18.4.5
- 17.2.10
- 20.4.1.1
- 20.15.4.1
Open-Source-Pakete OSV
Betroffene Bibliotheken laut OSV, mit behobenen Versionen.
Zeitverlauf
-
Veröffentlichung
-
Ausnutzung gemeldet (ENISA)
-
Aufnahme in den KEV-Katalog
-
CISA-Frist zur Behebung
-
EPSS-Höchstwert: 91,8 %
Referenzen
Weitere ausgenutzte Schwachstellen desselben Herstellers
- CVE-2026-76418Cisco Secure Firewall ASA Software and Cisco Secure FTD Software Unchecked Return Value to NULL Pointer Dereference Vulnerability5,3 · Stark steigend
- CVE-2026-76519Cisco Secure Email Gateway Relative Path Traversal Vulnerability5,8 · Stark steigend
- CVE-2026-76504Cisco Catalyst SD-WAN Manager Hex Encoding Vulnerability7,5 · Aktiv ausgenutzt
- CVE-2026-76460Cisco Identity Services Engine Incorrect Use of Privileged APIs Vulnerability8,7 · Aktiv ausgenutzt
- CVE-2026-76461Cisco Secure Email Gateway SQL Injection Vulnerability7,2 · Aktiv ausgenutzt
- CVE-2026-20079Cisco Firewall Management Center Authentication Bypass Using an Alternate Path or Channel Vulnerability9,1 · Aktiv ausgenutzt