apcupsd vulnerabilities

Vulnerability in apcupsd through 3.14.14 discloses uninitialized stack memory in getupsvar() in src/cgi/upsfetch.c (used by upsstats.cgi, multimon.cgi, and upsfstats.cgi). On the single-field path, when the matched STATUS line has fewer than three whitespace-separated tokens, sscanf("%*s %*s %s", answer) performs no assignment but the function returns success, and thus the caller prints the uninitialized destination buffer into the HTTP response.

apcupsd through 3.14.14 has an sscanf stack-based buffer overflow in getupsvar() in src/cgi/upsfetch.c (used by upsstats.cgi, multimon.cgi, and upsfstats.cgi), a related issue to CVE-2026-15544.

In Shibby Tomato up to version 1.28.0000, a vulnerability was found in the main function of the file www/apcupsd/tomatodata.cgi of the apcupsd component. Manipulation leads to an out-of-bounds write. The attack can be launched remotely, and the exploit is publicly available.