CVE-2019-20041: debian debian_linux Improper Input Validation
CVSS: 9.8v3.1CriticalModified
AliasesUBUNTU-CVE-2019-20041DEBIAN-CVE-2019-20041DLA-2067-1
Published 27-12-2019Last modified 05-08-2024
Vulnerability summary
CVE-2019-20041 is a critical (CVSS 9.8) Improper Input Validation vulnerability in debian debian_linux. EPSS estimates a 4.53% chance of exploitation in the next 30 days, higher than 91.4% of scored vulnerabilities.
CVSS score
9.8/10
010
Critical · v3.1 (NVD)EPSS score
4.53%
0%100%
Low · -0.13 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 1Timeline
- 27-12-2019PublishedVulnerability first disclosed.
- 05-08-2024Last modifiedVulnerability information updated.
Description
wp_kses_bad_protocol in wp-includes/kses.php in WordPress before 5.3.1 mishandles the HTML5 colon named entity, allowing attackers to bypass input sanitization, as demonstrated by the javascript: substring.
CVSS metrics
5 scores · 4 sources · 2 versionsCritical 9.8Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HSources4 sources · 6.4–9.8
- OSV · UbuntuEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- wordfenceSource6.4MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:NDiffers
High 7.5Preferred score · NVD (NIST)
AV:N/AC:L/Au:N/C:P/I:P/A:PSourcesSingle source
EPSS trend
Probability
4.53%
Chance of exploitation in the next 30 days
Percentile
91%
Versus all other CVEs
30-day change
-0.13 pp
From 4.65% on 20-09-2026
20-09-202620-10-2026
EPSS score4.53%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-20Improper Input ValidationThe product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
- CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
Affected systems
Debian2 products
- wordpress< 5.3.2+dfsg1-1 | < 4.1.29+dfsg-0+deb8u1
- debian_linuxEOL8.0 | 9.0 | 10.0
Wordpress2 products
- wordpress< 3.7 (fixed in 3.7.32) | ≥ 3.7, ≤ 3.7.31 (fixed in 3.7.32) | ≥ 3.8, ≤ 3.8.31 (fixed in 3.7.32) | ≥ 3.9, ≤ 3.9.29 (fixed in 3.7.32) | ≥ 4.0, ≤ 4.0.28 (fixed in 3.7.32) | ≥ 4.1, ≤ 4.1.28 (fixed in 3.7.32) | ≥ 4.2, ≤ 4.2.25 (fixed in 3.7.32) | ≥ 4.3, ≤ 4.3.21 (fixed in 3.7.32) | ≥ 4.4, ≤ 4.4.20 (fixed in 3.7.32) | ≥ 4.5, ≤ 4.5.19 (fixed in 3.7.32) | ≥ 4.6, ≤ 4.6.16 (fixed in 3.7.32) | ≥ 4.7, ≤ 4.7.15 (fixed in 3.7.32) | ≥ 4.8, ≤ 4.8.11 (fixed in 3.7.32) | ≥ 4.9, ≤ 4.9.12 (fixed in 3.7.32) | ≥ 5.0, ≤ 5.0.7 (fixed in 3.7.32) | ≥ 5.1, ≤ 5.1.3 (fixed in 3.7.32) | ≥ 5.2, ≤ 5.2.4 (fixed in 3.7.32) | 5.3 (fixed in 3.7.32)
- wordpress< 5.3.1
Ubuntu1 product
- wordpressAll versions (No fix recorded)
3 vendors · 5 products
References
10 links- wordpress.org/news/2019/12/wordpress-5-3-1-security-and-maintenance-release/X Refsource MISCREPORTRelease NotesVendor Advisory
- github.com/WordPress/wordpress-develop/commit/b1975463dd995da19bb40d3fa0786498717e3c53X Refsource MISCREPORTPatch
- lists.debian.org/debian-lts-announce/2020/01/msg00010.htmlMailing ListX Refsource MLISTThird Party Advisory