CVE-2026-103432 apcupsd - Buffer Overflow

apcupsd through 3.14.14 contains a stack-based buffer overflow caused by improper use of sscanf in getupsvar() in src/cgi/upsfetch.c, letting attackers cause denial of service or potentially execute code, exploit requires crafted input to vulnerable CGI scripts.

CVSS base score 8.1 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.38% chance of exploitation in 30 days
View the NVD record ↗

Details

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

Vendor fix

Update to a version later than 3.14.14 or the latest available version.

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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