CVE-2020-6816: fedoraproject fedora
Vulnerability summary
CVE-2020-6816 is a medium (CVSS 6.1) vulnerability in fedoraproject fedora. EPSS estimates a 1.34% chance of exploitation in the next 30 days, higher than 71.3% of scored vulnerabilities. 2 public exploits are recorded.
Not severe (CVSS 6.1, network access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 5 · Related 5Timeline
- 24-03-2020PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
In Mozilla Bleach before 3.12, a mutation XSS in bleach.clean when RCDATA and either svg or math tags are whitelisted and the keyword argument strip=False.
CVSS metrics
7 scores · 5 sources · 3 versions- OSV · PypiEcosystem advisory · calculated6.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- OSV · UbuntuEcosystem advisory · calculated6.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- OSV · DebianEcosystem advisory · calculated6.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- OSV · AlpineEcosystem advisory · calculated6.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
EPSS trend
Probability
1.34%
Chance of exploitation in the next 30 days
Percentile
71%
Versus all other CVEs
30-day change
No change 0.00 pp
From 1.34% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
2 foundExploit Reference (checkmarx.com)
Maturity: unknown
Exploit Reference (advisory.checkmarx.net)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, user interaction (CVSS vector). Other conditions: not stated in public data.
Alpine1 product
- py3-bleach< 3.1.2-r0
Debian1 product
- python-bleach< 3.1.2-0+deb10u1 | < 3.1.3-1
Fedoraproject1 product
- fedoraEOL33
Mozilla1 product
- bleach< 3.1.2
PyPI1 product
- bleach< 3.1.2
Ubuntu1 product
- python-bleach< 1.4.2-1ubuntu0.1~esm1 | < 2.1.2-1ubuntu0.1~esm1 | < 3.1.1-1ubuntu0.1~esm1
6 vendors · 6 products
References
17 links- github.com/mozilla/bleach/security/advisories/GHSA-m6xf-fq7q-8743X Refsource MISCWEBAdvisoryREPORTThird Party Advisory
- www.checkmarx.com/blog/vulnerabilities-discovered-in-mozilla-bleachX Refsource MISCWEBARTICLEExploitThird Party Advisory
- github.com/mozilla/bleachPACKAGE
