TI-2021-05521 Aliases CVE-2021-22567

Bidirectional Override in Dart SDK

LOW 22CWE-284Published 2022-01-05 · Updated 2025-04-21

Key facts

Attack vector: Network
Privileges required: Low
User interaction: Required
Attack complexity: Low
Impact type: Security bypass
Confidentiality · integrity · availability: None · Low · Low
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-284.

Summary

Bidirectional Unicode text can be interpreted and compiled differently than how it appears in editors which can be exploited to get nefarious code passed a code review by appearing benign. An attacker could embed a source that is invisible to a code reviewer that modifies the behavior of a program in unexpected ways.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00618 49th percentileScored 2026-11-07

Fix Fixed Dart SDK (Google LLC): 2.15.0-268.18.beta

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Google	Dart SDK	before 2.15.0-268.18.beta	2.15.0-268.18.beta	Patch available	CNA

Dart SDK VendorGoogle Affected before 2.15.0-268.18.beta Fixed in 2.15.0-268.18.beta Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:dart:dart_software_development_kit::::::::	before 2.15.0	Vulnerable	Dart

cpe:2.3:a:dart:dart_software_development_kit:*:*:*:*:*:*:*:* Versions before 2.15.0 Vulnerable ·Dart

Remediation

Fix · CNA Dart SDK (Google LLC) Fixed in 2.15.0-268.18.beta

Timeline

2026-10-02 Threatist record created from CVE-2021-22567

References

Patch 1

https://github.com/dart-lang/sdk/commit/52519ea8eb4780c468c4c2ed00e7c8046ccfed41

Advisory 1

https://github.com/dart-lang/sdk/blob/main/CHANGELOG.md

TI-2025-09686 Type confusion in Google Chrome KEVCVSS 3.1CRITICAL 9.8
TI-2024-07390 Type confusion in Google Chrome KEVCVSS 3.1CRITICAL 9.6
TI-2024-04898 Type confusion in Google Chrome KEVCVSS 3.1CRITICAL 9.6
TI-2024-04600 Type confusion in Google Chrome KEVCVSS 3.1CRITICAL 9.6
TI-2024-04346 Use after free in Google Chrome KEVCVSS 3.1CRITICAL 9.6
TI-2023-05824 Integer overflow in Google Chrome KEVCVSS 3.1CRITICAL 9.6

See all 17247 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences