CVE-2020-5243

uap-core before 0.7.3 is vulnerable to a denial of service attack when processing crafted User-Agent strings. Some regexes are vulnerable to regular expression denial of service (REDoS) due to overlapping capture groups. This allows remote attackers to overload a server by setting the User-Agent header in an HTTP(S) request to maliciously crafted long strings. This has been patched in uap-core 0.7.3.

• CWE-20
• CWE-1333

• https://github.com/ua-parser/uap-core/commit/0afd61ed85396a3b5316f18bfd1edfaadf8e88e1Patch
• https://github.com/ua-parser/uap-core/security/advisories/GHSA-cmcx-xhr8-3w9pExploit, Third Party Advisory
• https://github.com/ua-parser/uap-core/commit/0afd61ed85396a3b5316f18bfd1edfaadf8e88e1Patch
• https://github.com/ua-parser/uap-core/security/advisories/GHSA-cmcx-xhr8-3w9pExploit, Third Party Advisory

Published

Feb 21, 2020

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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