CVE-2020-7733 is a high-severity (CVSS 7.5) Uncontrolled Resource Consumption vulnerability in ua-parser-js. 3 public exploit or proof-of-concept references are indexed, so weaponization risk is real. A fix is available for ua-parser-js — see the affected versions and patch details below.
Regular Expression Denial of Service in ua-parser-js
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
Real-World Exposure
How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.
ua-parser-jsnpmDescription
The package ua-parser-js before 0.7.22 are vulnerable to Regular Expression Denial of Service (ReDoS) via the regex for Redmi Phones and Mi Pad Tablets UA.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | ua-parser-js | all versions | 0.7.22npm install ua-parser-js@0.7.22 |
Affected Products
communications cloud native core network function cloud native environmentoracleua-parser-jsua-parser-js_projectResearch use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for ua-parser-js, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update ua-parser-js to 0.7.22 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-7733 is resolved across your whole dependency graph.
Workarounds
Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.
Fixing This On Your OS
If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.
Red Hat OpenShift Container Platform 4 delivers the kibana package where the ua-parser-js library is bundled, but during the update to container first (to openshift4/ose-logging-kibana6) the dependency was removed and hence kibana package is marked as wontfix. This may be fixed in the future.
| Product | Fixed in | Advisory |
|---|---|---|
| Red Hat Virtualization Engine 4.4 | ovirt-engine-ui-extensions-0:1.2.7-1.el8ev | RHSA-2021:2865 |
| Red Hat Virtualization Engine 4.4 | ovirt-web-ui-0:1.7.2-1.el8ev | RHSA-2021:4626 |
Frequently Asked Questions
Is CVE-2020-7733 in your dependencies?
Find it across npm, including transitive dependencies.