CVE-2021-27292
CVSS v3
7.5
HIGH
EPSS Score
3.4 %
exploit probability, as of 2026-09-25
CISA KEV
No
known exploited
Exploitation
—
SSVC status
Description
ua-parser-js >= 0.7.14, fixed in 0.7.24, uses a regular expression which is vulnerable to denial of service. If an attacker sends a malicious User-Agent header, ua-parser-js will get stuck processing it for an extended period of time.
Technical details
- Published
- 2021-03-17
Frequently asked questions
What is CVE-2021-27292?
ua-parser-js >= 0.7.14, fixed in 0.7.24, uses a regular expression which is vulnerable to denial of service. If an attacker sends a malicious User-Agent header, ua-parser-js will get stuck processing it for an extended period of time.
Is CVE-2021-27292 actively exploited?
Active exploitation of CVE-2021-27292 has not been confirmed. Its EPSS score was 3.4% on 2026-09-25, the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2021-27292?
CVE-2021-27292 has a CVSS v3 base score of 7.5 (HIGH severity).
Is CVE-2021-27292 affecting your environment?
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