$ cve CVE-2019-17041 JSON

CVE-2019-17041

9.8

CRITICAL · CVSS 3.1 · EPSS 4.4% (pctl 91)

In your normal cycle

Critical by CVSS (9.8), but no sign of active exploitation.

Description

An issue was discovered in Rsyslog v8.1908.0. contrib/pmaixforwardedfrom/pmaixforwardedfrom.c has a heap overflow in the parser for AIX log messages. The parser tries to locate a log message delimiter (in this case, a space or a colon) but fails to account for strings that do not satisfy this constraint. If the string does not match, then the variable lenMsg will reach the value zero and will skip the sanity check that detects invalid log messages. The message will then be considered valid, and the parser will eat up the nonexistent colon delimiter. In doing so, it will decrement lenMsg, a signed integer, whose value was zero and now becomes minus one. The following step in the parser is to shift left the contents of the message. To do this, it will call memmove with the right pointers to the target and destination strings, but the lenMsg will now be interpreted as a huge value, causing a heap overflow.

Scoring

CVSS	9.8 (CRITICAL, v3.1)
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS	4.45% — more likely to be exploited than 91% of all CVEs
Weakness	CWE-787
On CISA KEV	no
Public exploit	none known
Published	2019-10-07
Last modified	2026-06-17

Affected (4)

Vendor	Product
debian	debian linux
fedoraproject	fedora
opensuse	leap
rsyslog	rsyslog

References

→ the Explorer · watch your stack · NVD