CVE-2021-37311
Buffer Overflow vulnerability in fcitx5 5.0.8 allows attackers to cause a denial of service via...
Buffer Overflow vulnerability in fcitx5 5.0.8 allows attackers to cause a denial of service via crafted message to the application's listening port.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
Buffer Overflow vulnerability in fcitx5 5.0.8 allows attackers to cause a denial of service via crafted message to the application's listening port.
- Record
CVE-2021-37311- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-120
- Updated
- 2026-11-02
CVE List
Buffer Overflow vulnerability in fcitx5 5.0.8 allows attackers to cause a denial of service via crafted message to the application's listening port.
- Record
CVE-2021-37311- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-120
- Updated
- 2026-11-02
EUVDEUVD-2021-23880
Buffer Overflow vulnerability in fcitx5 5.0.8 allows attackers to cause a denial of service via crafted message to the application's listening port.
- Record
EUVD-2021-23880- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-2cp5-jwv5-w755
Buffer Overflow vulnerability in fcitx5 5.0.8 allows attackers to cause a denial of service via...
Buffer Overflow vulnerability in fcitx5 5.0.8 allows attackers to cause a denial of service via crafted message to the application's listening port.
- Record
GHSA-2cp5-jwv5-w755- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-120
- Updated
- 2026-11-02
OSV
Buffer Overflow vulnerability in fcitx5 5.0.8 allows attackers to cause a denial of service via crafted message to the application's listening port.
- Record
CVE-2021-37311- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVDEBIAN-CVE-2021-37311
Buffer Overflow vulnerability in fcitx5 5.0.8 allows attackers to cause a denial of service via crafted message to the application's listening port.
- Record
DEBIAN-CVE-2021-37311- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVUBUNTU-CVE-2021-37311
Buffer Overflow vulnerability in fcitx5 5.0.8 allows attackers to cause a denial of service via crafted message to the application's listening port.
- Record
UBUNTU-CVE-2021-37311- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
fcitx5Debian:12 | before 5.0.9-1 | 5.0.9-1 |
fcitx5Debian:13 | before 5.0.9-1 | 5.0.9-1 |
fcitx5Debian:14 | before 5.0.9-1 | 5.0.9-1 |
fcitx5Ubuntu:20.04:LTS | All versions, plus listed versions 0~20181128+ds1-1build10~20191021+ds1-10~20191021+ds2-10~20191021+ds2-20.0~git20191114.c2b3517+ds1-1 Show 6 moreShow less0.0~git20191231.c0a272a+ds1-10.0~git20191231.c0a272a+ds1-20.0~git20200117.a2871df+ds2-10.0~git20200128.9e3bc8d+ds1-10.0~git20200128.9e3bc8d+ds1-20.0~git20200128.9e3bc8d+ds1-3 | None known |
fcitx5Ubuntu:22.04:LTS | All versions, plus listed versions 5.0.5-1ubuntu25.0.9-25.0.10-15.0.11-15.0.12-15.0.13-15.0.14-1 | None known |
fcitx5Ubuntu:24.04:LTS | All versions, plus listed versions 5.1.0-15.1.1-15.1.2-15.1.3-15.1.4-1 Show 6 moreShow less5.1.5-15.1.6-15.1.6-25.1.7-15.1.7-1build25.1.7-1build3 | None known |
fcitx5Ubuntu:25.10 | All versions, plus listed versions 5.1.12-25.1.14-1 | None known |
fcitx5Ubuntu:26.10 | All versions, plus listed versions 5.1.19-15.1.20-15.1.21-15.1.22-1 | None known |
fcitx5Ubuntu:26.04:LTS | All versions, plus listed versions 5.1.14-15.1.16-15.1.17-15.1.19-1 | None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-37311 is a high vulnerability (CVSS 7.5) in Fcitx 5 Project 5, published February 3, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.93%, the 60th percentile. Fixed in fcitx5 5.0.9-1.