Visual Reordering Vulnerability in Unicode Specification Affecting Multiple Software Vendors
CVE-2021-42574
Key Information:
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What is CVE-2021-42574?
A vulnerability in the Unicode Specification, particularly in the Bidirectional Algorithm, allows adversaries to manipulate the visual order of characters. This can lead to confusion when analyzing source code, as the logical order of tokens processed by compilers and interpreters may differ from their visual representation. Attackers can exploit this to hide malicious code within seemingly innocuous characters by crafting source code that appears one way to human reviewers while being processed differently by machines, creating a risk for applications supporting Unicode. Careful implementation and adherence to Unicode's security guidelines are crucial to mitigate this vulnerability.
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Exploit Proof of Concept (PoC)
PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.
References
EPSS Score
23% chance of being exploited in the next 30 days.
CVSS V3.1
Timeline
- 🟡
Public PoC available
- 👾
Exploit known to exist
Vulnerability published
Vulnerability Reserved