CVE-2026-20129

EUVD-2026-8677
A vulnerability in the API user authentication of Cisco Catalyst SD-WAN Manager could allow an unauthenticated, remote attacker to gain access to an affected system as a user who has the netadmin role.

The vulnerability is due to improper authentication for requests that are sent to the API. An attacker could exploit this vulnerability by sending a crafted request to the API of an affected system. A successful exploit could allow the attacker to execute commands with the privileges of the netadmin role.
Note: Cisco Catalyst SD-WAN Manager releases 20.18 and later are not affected by this vulnerability. 
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
9.8 CRITICAL
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Affected Products (NVD)
VendorProductVersion
ciscocatalyst_sd-wan_manager
𝑥
< 20.9.8.2
ciscocatalyst_sd-wan_manager
20.11 ≤
𝑥
< 20.12.5.3
ciscocatalyst_sd-wan_manager
20.13 ≤
𝑥
< 20.15.4.2
ciscocatalyst_sd-wan_manager
20.16 ≤
𝑥
< 20.18
ciscocatalyst_sd-wan_manager
20.12.6
𝑥
= Vulnerable software versions