Description
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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| apcupsd | apcupsd | ≤ 3.14.14 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | apcupsd | No fix yet | — |
| Debian 13 | apcupsd | No fix yet | — |
| Debian 12 | apcupsd | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | apcupsd | No fix yet | — |
| Ubuntu 26.04 LTS | apcupsd | No fix yet | — |
| Ubuntu 24.04 LTS | apcupsd | No fix yet | — |
| Ubuntu 22.04 LTS | apcupsd | No fix yet | — |
| Ubuntu 20.04 LTS | apcupsd | No fix yet | — |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | apcupsd | No fix yet | — |
| Ubuntu 16.04 LTS | apcupsd | No fix yet | — |