Vulnerability · Published Feb 3, 2023 · Assigned by mitre
CVE-2021-37311
High 7.5
In plain English
A high-severity buffer overflow in the fcitx5 package (Debian). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 61% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.9%top 39.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | fcitx5 | 5.0.9-1 | DEBIAN-CVE-2021-37311 |
| Debian:13 | fcitx5 | 5.0.9-1 | DEBIAN-CVE-2021-37311 |
| Debian:14 | fcitx5 | 5.0.9-1 | DEBIAN-CVE-2021-37311 |
| Ubuntu:22.04:LTS | fcitx5 | no fix listed | UBUNTU-CVE-2021-37311 |
| Ubuntu:24.04:LTS | fcitx5 | no fix listed | UBUNTU-CVE-2021-37311 |
| Ubuntu:25.10 | fcitx5 | no fix listed | UBUNTU-CVE-2021-37311 |
| Ubuntu:26.04:LTS | fcitx5 | no fix listed | UBUNTU-CVE-2021-37311 |
| Ubuntu:26.10 | fcitx5 | no fix listed | UBUNTU-CVE-2021-37311 |
Affected products (as reported)
Weakness: CWE-120 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H