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CVE-2018-20250

7.8 · HIGHActively Exploited

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).

Published Feb 5, 2019CWE-36EPSS 96.00%

Overview

CVE-2018-20250 is a high-severity vulnerability. It was published on February 5, 2019 and has a CVSS 3.1 base score of 7.8 (HIGH). This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild.

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refpacketstormsecurity.com/files/152618/RARLAB-WinRAR-ACE-Format-Input-Validation-Remote-Code-Execution.htmlRefwww.rapid7.com/db/modules/exploit/windows/fileformat/winrar_aceRefwww.securityfocus.com/bid/106948GitHubgithub.com/blau72/CVE-2018-20250-WinRAR-ACERefresearch.checkpoint.com/extracting-code-execution-from-winrar/Refwww.exploit-db.com/exploits/46552/Refwww.exploit-db.com/exploits/46756/Refwww.win-rar.com/whatsnew.htmlRefpacketstormsecurity.com/files/152618/RARLAB-WinRAR-ACE-Format-Input-Validation-Remote-Code-Execution.htmlRefwww.rapid7.com/db/modules/exploit/windows/fileformat/winrar_ace

How CyberStrike helps

Frequently asked questions

What is CVE-2018-20250?

CVE-2018-20250 is a high-severity vulnerability. It was published on February 5, 2019 and has a CVSS 3.1 base score of 7.8 (HIGH). This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild.

How severe is CVE-2018-20250?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2018-20250?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2018-20250?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2018-20250 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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