High severity · published Feb 21, 2020
CVE-2020-5243
uap-core before 0.7.3 is vulnerable to a denial of service attack when processing crafted User-Agent strings
7.5
CVSS
2.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)2.3% · higher than 83% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
UA
Uap-core · Uap-core Project
before 0.7.3 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-5243
CVE.org
https://www.cve.org/CVERecord?id=CVE-2020-5243
Patch
https://github.com/ua-parser/uap-core/commit/0afd61ed85396a3b5316f18bfd1edfaadf8e88e1
Exploit
https://github.com/ua-parser/uap-core/security/advisories/GHSA-cmcx-xhr8-3w9p
More from Uap-core
5.3
CVE-2021-21317
uap-core in an open-source npm package which contains the core of BrowserScope's original user agent string parser