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CVE-2020-6817

24
FAUCET Score

CVE-2020-6817 describes a Regular Expression Denial of Service (ReDoS) vulnerability in the mozilla bleach library, specifically within the bleach.clean function when processing style attributes. This vulnerability carries a CVSS score of 7.5 (HIGH), indicating that it can be exploited remotely with low attack complexity, leading to a denial of service. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 3.1.4CPE matchmatch criteria
cpe:2.3:a:mozilla:bleach:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/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
3.1

Exploit Intelligence

EPSS Score
0.72%
Probability of exploitation in next 30 days
EPSS Percentile
50.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0072 is in the 26th 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

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 (5)

pippatch availablevia ghsa
Product: bleachFixed in: 3.1.4
ubuntupatch availablevia ubuntu_usn
Product: python-bleach (xenial)Fixed in: 1.4.2-1ubuntu0.1~esm1
ubuntupatch availablevia ubuntu_usn
Product: python-bleach (bionic)Fixed in: 2.1.2-1ubuntu0.1~esm1
ubuntupatch availablevia ubuntu_usn
Product: python-bleach (focal)Fixed in: 3.1.1-1ubuntu0.1~esm1
github_advisoryvendor investigatingvia nvd_reference
View patch

Vendor Advisories (2)

ubuntuUSN-8077-1

Bleach vulnerabilities

Mar 5, 2026
pipGHSA-vqhp-cxgc-6wmmhigh

regular expression denial-of-service (ReDoS) in Bleach

Mar 30, 2020

References

bugzilla.mozilla.org / show_bug.cgi
ExploitIssue Tracking
github.com / mozilla/bleach/security/advisories/GHSA-vqhp-cxgc-6wmm
Vendor Advisory