CVE-2017-16030
CVSS v3
7.5
HIGH
EPSS Score
1.2 %
exploit probability, as of 2026-09-25
CISA KEV
No
known exploited
Exploitation
—
SSVC status
Description
Useragent is used to parse useragent headers. It uses several regular expressions to accomplish this. An attacker could edit their own headers, creating an arbitrarily long useragent string, causing the event loop and server to block. This affects Useragent 2.1.12 and earlier.
Technical details
- Published
- 2018-06-04
Frequently asked questions
What is CVE-2017-16030?
Useragent is used to parse useragent headers. It uses several regular expressions to accomplish this. An attacker could edit their own headers, creating an arbitrarily long useragent string, causing the event loop and server to block. This affects Useragent 2.1.12 and earlier.
Is CVE-2017-16030 actively exploited?
Active exploitation of CVE-2017-16030 has not been confirmed. Its EPSS score was 1.2% on 2026-09-25, the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2017-16030?
CVE-2017-16030 has a CVSS v3 base score of 7.5 (HIGH severity).
Is CVE-2017-16030 affecting your environment?
Use isMalicious to check if any of your IPs or domains are associated with this vulnerability's IOCs.
No credit card required · 500 free checks/month · Free API key
Other 2017 vulnerabilities worth triaging
Ranked by exploit probability (EPSS).