CVE-2021-42694
An issue was discovered in the character definitions of the Unicode Specification through 14.0. The specification allows an adversary to produce source code identifiers such as function names using
02 Description
An issue was discovered in the character definitions of the Unicode Specification through 14.0. The specification allows an adversary to produce source code identifiers such as function names using
03 Exploitation and scoring
- Exploitation
- Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.
- SSVC decision
- ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
- AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
- Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.
- EPSS probability
- 4.91% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 91.9% of scored records. A rank, not a probability.
- NVD base score
- 8.3 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H
- NVD analysis status
- Modified. NVD last modified this record on 2026-06-17.
- Red Hat severity
- Moderate. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2021-11-01 00:00Z4 YR AGO
- Last updated
- 2024-10-29 13:41Z2 YR AGO
- Reserved
- 2021-10-18
- Assigning CNA
- mitre
- Record state
- PUBLISHED
- Severity
- High (CVSS 8.3)
- CNA CVSS vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H
- Weaknesses
- Data version
- 5.1
- Document digest
- 18db1e2ff9a03781d8e6a859d61ba58fa8e4b89a23355cf98e872654317f41fc
05 Affected products
06 References
- www.unicode.orghttp://www.unicode.org/versions/Unicode14.0.0/
- trojansource.codeshttps://trojansource.codes
- www.openwall.com[oss-security] 20211101 CVE-2021-42574: rustc 1.56.0 and bidirectional-override codepoints in source codehttp://www.openwall.com/lists/oss-security/2021/11/01/1
- www.openwall.com[oss-security] 20211101 Trojan Source Attackshttp://www.openwall.com/lists/oss-security/2021/11/01/6
- www.kb.cert.orgVU#999008https://www.kb.cert.org/vuls/id/999008
- www.scyon.nlhttps://www.scyon.nl/post/trojans-in-your-source-code
- www.unicode.orghttps://www.unicode.org/reports/tr36/
- www.unicode.orghttps://www.unicode.org/reports/tr39/
- cwe.mitre.orghttps://cwe.mitre.org/data/definitions/1007.html
- security.gentoo.orgGLSA-202210-09https://security.gentoo.org/glsa/202210-09
07 Fixed in
Arch Linux
- rust Not affected
Source: Arch Linux Security Tracker, the Arch Linux security team. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.