CVE-2026-66086 Modem OTA stack - Buffer Overflow

Modem OTA stack contains a stack-based buffer overflow caused by improper validation of scheduling information in SIB1 messages, letting remote attackers execute code or cause denial of service, exploit requires no special privileges.

CVSS base score 9.8 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.46% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Buffer Overflow
Impact
Remote Code Execution, Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
12 October 2026
Updated
15 October 2026
Weakness
CWE-121

Vendor fix

Update to the latest version with proper validation of scheduling information in SIB1 messages.

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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