VULNERABILITY INTELLIGENCE

CVE-2020-5243

CVSS score5.7 MEDIUM

EPSS probability2.29%

CISA KEVNot currently listed

Published2020-02-21

Last modified2026-06-17

CVSS vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H

Description

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.

Weakness classification

CWE-20: Improper Input Validation
CWE-1333: Inefficient Regular Expression Complexity

Primary references

security-advisories@github.com — Patch
security-advisories@github.com — Exploit, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 — Patch
af854a3a-2127-422b-91ae-364da2661108 — Exploit, Third Party Advisory