Vulnerability Intelligence Report
Bidirectional Override in Dart SDK
CVE-2021-22567
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.
No Active Exploit Signals
CVSS Base Score
4.6
MEDIUM
Exploitability:2.1
Impact Score:2.6
EPSS Probability:0.60%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
—
Authentication
—
Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-284 ↗CWE-284 Improper Access Control
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| Google LLC | Dart SDK | unspecified < 2.15.0-268.18.beta (affected) |
Threat Intelligence Signals
EPSS Score
0.599%
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | Google LLC · Vendor · USA |
| Reserved | 2021-01-05T00:00:00 |
| Published | 2022-01-05T10:55:11 |
| Patch Date | 2021-11-16 |
| Last Updated | 2025-04-21T13:57:18 |
Community Chatter & Buzz