CVE-2018-20164

User Agent Parser Core vulnerability

CVSS

5.3

EPSS

3.3%

EPSS pct

87th

Exploited

No known

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.)

Affected vendor

Uaparser

Affected product

User Agent Parser Core

CVSS vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Weakness type (CWE)

CWE-185

Published

2019-02-13

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to low impact to availability.

Its EPSS score of 3.3% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 87% of all scored CVEs.

Check your external exposure to CVE-2018-20164

Confirm whether Uaparser User Agent Parser Core is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2018-20164.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2018-20164

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2018-20164 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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