What’s Vulnerable › Vulnerabilities

CVE-2018-20251

• Severity: medium (CVSS 5.5 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 31.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2019-02-05 · updated 2026-06-17
• Weakness: CWE-693

Description

In WinRAR versions prior to and including 5.61, there is path traversal vulnerability when crafting the filename field of the ACE format. The UNACE module (UNACEV2.dll) creates files and folders as written in the filename field even when WinRAR validator noticed the traversal attempt and requestd to abort the extraction process. the operation is cancelled only after the folders and files were created but prior to them being written, therefore allowing the attacker to create empty files and folders everywhere in the file system.

Affected products

• WinRAR: through 5.61

References

• http://www.securityfocus.com/bid/106948
• https://research.checkpoint.com/extracting-code-execution-from-winrar/
• https://www.win-rar.com/whatsnew.html
• http://www.securityfocus.com/bid/106948
• https://research.checkpoint.com/extracting-code-execution-from-winrar/
• https://www.win-rar.com/whatsnew.html

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