CVE-2021-22567
Bidirectional Override in Dart SDK
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- Required
What an attacker can affect
- Confidentiality
- None
- Integrity
- Low
- Availability
- Low
Exploit likelihood
What each source reports
CVE List Score used
Bidirectional Override in Dart SDK
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.
- Record
CVE-2021-22567- CVSS 3.1
- 4.6 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:L - Weakness
- CWE-284
- Updated
- 2026-11-02
EUVDEUVD-2021-9706
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.
- Record
EUVD-2021-9706- CVSS 3.1
- 4.6 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:L - Updated
- 2026-11-02
NVD
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.
- Record
CVE-2021-22567- CVSS 3.1
- 4.6 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:L - CVSS 3.1
- 3.5 Low
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N - CVSS 2.0
- 3.5 Low
AV:N/AC:M/Au:S/C:N/I:P/A:N - Weakness
- CWE-284
- Updated
- 2026-11-02
OSV
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.
- Record
CVE-2021-22567- CVSS 3.1
- 3.5 Low
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N - Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-22567 is a medium vulnerability (CVSS 4.6) in Google Llc Dart Sdk, published January 5, 2022. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.62%, the 49th percentile. No source names a fixed version.