CVE-2021-20088
HIGHCVSS 8.8/10EPSS 1.45%
Last modified
CVE-2021-20088 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') in mootools-more 1.6.0 allows a malicious user to inject properties into Object.prototype.. EPSS estimates a 1.45% chance of exploitation in the next 30 days.
Description
Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') in mootools-more 1.6.0 allows a malicious user to inject properties into Object.prototype.
Metrics
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Mootools | Mootools-More | 1.6.0 |
References
- https://github.com/BlackFan/client-side-prototype-pollution/blob/master/pp/mootools-more.mdExploit, Third Party Advisory
- https://github.com/BlackFan/client-side-prototype-pollution/blob/master/pp/mootools-more.mdExploit, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-20088?
Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') in mootools-more 1.6.0 allows a malicious user to inject properties into Object.prototype.
How severe is CVE-2021-20088?
CVE-2021-20088 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 1.45% probability of exploitation in the next 30 days.
How do I fix CVE-2021-20088?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-20088?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST