VulnerabilityModified
CVE-2020-27511
An issue was discovered in the stripTags and unescapeHTML components in Prototype 1.7.3 where an attacker can cause a Regular Expression Denial of Service (ReDOS) through stripping crafted HTML tags.
HIGH 7.5EPSS 2.50%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (2.50%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
An issue was discovered in the stripTags and unescapeHTML components in Prototype 1.7.3 where an attacker can cause a Regular Expression Denial of Service (ReDOS) through stripping crafted HTML tags.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 2.50% probability · 84th percentile
- CISA KEV
- Not listed
- Affected
- prototypejs/prototype
- Source
- cve@mitre.org
References
- http://prototypejs.org/Vendor Advisory
- https://github.com/prototypejs/prototype/blob/dee2f7d8611248abce81287e1be4156011953c90/src/prototype/lang/string.js#L283Exploit, Third Party Advisory
- https://github.com/yetingli/PoCs/blob/main/CVE-2020-27511/Prototype.mdExploit, Third Party Advisory
- http://prototypejs.org/Vendor Advisory
- https://github.com/prototypejs/prototype/blob/dee2f7d8611248abce81287e1be4156011953c90/src/prototype/lang/string.js#L283Exploit, Third Party Advisory
- https://github.com/yetingli/PoCs/blob/main/CVE-2020-27511/Prototype.mdExploit, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.