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CVE-2017-16030

22
FAUCET Score

CVE-2017-16030 describes a denial-of-service vulnerability in the useragent_project useragent library, versions 2.1.12 and earlier. An attacker can craft an arbitrarily long user-agent string, causing the server's event loop to block due to excessive regular expression processing. This high-severity vulnerability (CVSS 7.5) requires no user interaction and can lead to a complete loss of availability. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 2.1.12CPE matchmatch criteria
cpe:2.3:a:useragent_project:useragent:*:*:*:*:*:node.js:*:*

CVSS Data

CVSS version used by this source: 3.0

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.16%
Probability of exploitation in next 30 days
EPSS Percentile
63.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0116 is in the 42nd percentile among its peer group of 51,485 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

npmpatch availablevia ghsa
Product: useragentFixed in: 2.1.13

Vendor Advisories (2)

npmGHSA-pjmx-9xr3-82qrhigh

ReDoS via long UserAgent header in useragent

Jul 24, 2018
redhatCVE-2017-16030Moderate

nodejs-useragent: Regular expression Denial-of-Service via long UserAgent header

Apr 15, 2017

References

nodesecurity.io / advisories/312
ExploitThird Party Advisory