Vulnerability in Uaparser User Agent Parser-Core
CVE-2018-20164
An issue was discovered in regex.yaml (aka regexes.yaml) in UA-Parser UAP-Core before 0.6.0. A Regular Expression Denial of Service (ReDoS) issue allows remote attackers to overload a server by setting the User-Agent header in an HTTP(S) request to a value containing a long digit string. (The UAP-Core project contains the vulnerability, propagating to all implementations.)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.033 (88.1th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 88th percentile — 88.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.033 · newest: 0.033 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/ua-parser/uap-core/commit/010ccdc7303546cd22b9da687c29f4a996990014 (Patch, Third Party Advisory)
- github.com/ua-parser/uap-core/commit/156f7e12b215bddbaf3df4514c399d683e6cdadc (Patch, Third Party Advisory)
- www.x41-dsec.de/lab/advisories/x41-2018-009-uaparser/ (Exploit, Third Party Advisory)
- github.com/ua-parser/uap-core/issues/332
Frequently asked questions
- What is CVE-2018-20164?
- CVE-2018-20164 is a medium-severity vulnerability in Uaparser User Agent Parser-Core, classified under Incorrect Regular Expression. CVSS score: 5.3/10. Published 2019-02-13.
- How severe is CVE-2018-20164?
- Medium severity. CVSS v3 base score is 5.3 out of 10.
- Is CVE-2018-20164 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.