CVE-2026-76490 Cisco Expressway Series - Out of Bounds Write

Cisco Expressway Series contains an out-of-bounds write vulnerability caused by improper memory handling, letting attackers potentially corrupt memory or cause denial of service, exploit requires crafted input.

CVSS base score 8.6 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
View the NVD record ↗

Details

Type
Out of Bounds Write
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Published
21 October 2026
Updated
22 October 2026
Weakness
CWE-787

Vendor fix

Update to the latest Cisco Expressway Series software version with security hardening.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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