Exploited· due 2022-08-157.8highHighused in ransomware

CVE-2018-20250

Rarlab Winrar

In WinRAR versions prior to and including 5.61, There is path traversal vulnerability when crafting the filename field of the ACE format (in UNACEV2.dll). When the filename field is manipulated with specific patterns, the destination (extraction) folder is ignored, thus treating the filename as an absolute path.

Exploitation status

CISA has confirmed this is being exploited in the wild. That is an observation of real attacks, not a prediction.
It is known to have been used in ransomware campaigns.
US federal civilian agencies are required to remediate it by 2022-08-15. That deadline does not bind private companies, but it is a reasonable benchmark for how urgently CISA views it.

Required action

Apply updates per vendor instructions.

CISA’s wording, unedited.

What the metrics mean

It is requires local access to the machine.
For an attacker who can reach it, no special conditions are needed to exploit it.
To exploit it, no account is needed.
Beyond that, someone has to be persuaded to take an action first.

Scoring

CVSS: 7.8 (v3.1)
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness: CWE-36
Assigned by: cve@checkpoint.com

Dates

Published: 2019-02-05
Last modified: 2026-08-13
Added to KEV: 2022-02-15
Remediation due: 2022-08-15
Sources: CISA KEV, NVD

Affected products

Rarlab Winrar- 5.61

As listed in the NVD configuration data. Not a statement about your estate.