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Cisco Catalyst SD-WAN flaw actively exploited

Published Vorant ratingelevated vulnerability

Vorant's rating weighs the evidence in the report: confirmed exploitation, victims claimed, CVSS and EPSS, and how many sources agree. It rates the report, not your assets.

CVE-2026-20262, a vulnerability in Cisco Catalyst SD-WAN allowing data integrity compromise, is under active exploitation across multiple product versions.

Sourcecert.ssi.gouv.fr — open the original

What to check

Applies to
The 1 CVE named below. Whether you run an affected version is not assessed: check the versions the source lists.
Exploitation
CISA lists CVE-2026-20262 as exploited in the wild.

Cisco has disclosed CVE-2026-20262, a vulnerability affecting multiple versions of Catalyst SD-WAN that enables attackers to compromise data integrity. The vendor has confirmed that this vulnerability is being actively exploited in the wild, elevating the urgency for affected organizations to apply patches immediately.

Affected versions span a wide range of Catalyst SD-WAN releases, including 20.9.x, 20.12.x, 20.15.x, 20.18.x, and 26.1.x series. Organizations running vulnerable versions should prioritize patching to the fixed releases specified in Cisco's security advisory. The active exploitation status indicates that threat actors have weaponized this vulnerability and are targeting exposed Catalyst SD-WAN deployments.

Mentioned in this report

Vulnerabilities CVE-2026-20262KEV

Related reporting

Source reporting: https://www.cert.ssi.gouv.fr/avis/CERTFR-2026-AVI-0756

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