Vulnerability · Published Jun 21, 2021 · Assigned by mitre
CVE-2020-27511
High 7.5
In plain English
A high-severity security flaw in the prototypejs package (Debian). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 3.3% (higher than 89% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)7.5High
Exploit odds (30 days)3.3%top 11.3% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | prototypejs | 1.7.3-1 | DEBIAN-CVE-2020-27511 |
| Debian:13 | prototypejs | 1.7.3-1 | DEBIAN-CVE-2020-27511 |
| Debian:14 | prototypejs | 1.7.3-1 | DEBIAN-CVE-2020-27511 |
| Ubuntu:22.04:LTS | prototypejs | no fix listed | UBUNTU-CVE-2020-27511 |
| Ubuntu:24.04:LTS | prototypejs | no fix listed | UBUNTU-CVE-2020-27511 |
| Ubuntu:25.10 | prototypejs | no fix listed | UBUNTU-CVE-2020-27511 |
| Ubuntu:26.04:LTS | prototypejs | no fix listed | UBUNTU-CVE-2020-27511 |
| Ubuntu:26.10 | prototypejs | no fix listed | UBUNTU-CVE-2020-27511 |