CVE-2021-37311

HIGHNVD 7.57.5—Trending — 3 sources updated this week

7.5

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.

CVSS v3: 7.5
EG Score: 7.5(medium)
EPSS: 61.0%
KEV: Not listed

Published

February 3, 2023

Last Modified

March 26, 2025

References (4)

cve@mitrehttps://fcitx-im.org
cve@mitrehttps://github.com/fcitx/fcitx5/pull/308
af854a3a-2127-422b-91ae-364da2661108https://fcitx-im.org
af854a3a-2127-422b-91ae-364da2661108https://github.com/fcitx/fcitx5/pull/308

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-120Buffer Copy without Checking Size (Classic Buffer Overflow)

Data Freshness Timeline

(refreshed 11× in last 7d / 11× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-28 13:43 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-25 07:26 UTCEG score recompute
2026-05-25 07:26 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2021-37311?

CVE-2021-37311 is a high vulnerability published on February 3, 2023. 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.

When was CVE-2021-37311 disclosed?

CVE-2021-37311 was first published in the National Vulnerability Database on February 3, 2023, with the most recent update on March 26, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-37311 actively exploited?

CVE-2021-37311 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 61.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-37311?

CVE-2021-37311 has a CVSS v3 base score of 7.5 (NVD).

How do I remediate CVE-2021-37311?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-37311, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2021-37311

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CVE-2021-37311

📅 Published

🔄 Last Modified

🔗 References (4)