CVE-2020-26422

LOWNVD 3.75.3▲

3.7

Buffer overflow in QUIC dissector in Wireshark 3.4.0 to 3.4.1 allows denial of service via packet injection or crafted capture file

CVSS v3: 3.7
EG Score: 5.3(medium)
EPSS: 50.6%
KEV: Not listed

Published

December 21, 2020

Last Modified

November 21, 2024

References (10)

cve@gitlabhttps://gitlab.com/gitlab-org/cves/-/blob/master/2020/CVE-2020-26422.json
cve@gitlabhttps://gitlab.com/wireshark/wireshark/-/issues/17073
cve@gitlabhttps://security.gentoo.org/glsa/202101-12
cve@gitlabhttps://www.oracle.com/security-alerts/cpuApr2021.html
cve@gitlabhttps://www.wireshark.org/security/wnpa-sec-2020-20.html
af854a3a-2127-422b-91ae-364da2661108https://gitlab.com/gitlab-org/cves/-/blob/master/2020/CVE-2020-26422.json
af854a3a-2127-422b-91ae-364da2661108https://gitlab.com/wireshark/wireshark/-/issues/17073
af854a3a-2127-422b-91ae-364da2661108https://security.gentoo.org/glsa/202101-12
af854a3a-2127-422b-91ae-364da2661108https://www.oracle.com/security-alerts/cpuApr2021.html
af854a3a-2127-422b-91ae-364da2661108https://www.wireshark.org/security/wnpa-sec-2020-20.html

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 10× in last 7d / 10× 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.

2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 23:09 UTCEG score recompute
2026-05-26 23:09 UTCGHSA enrichment
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-24 16:48 UTCepss_batch
2026-05-23 09:31 UTCOSV refresh

Frequently asked(5)

What is CVE-2020-26422?

CVE-2020-26422 is a low vulnerability published on December 21, 2020. Buffer overflow in QUIC dissector in Wireshark 3.4.0 to 3.4.1 allows denial of service via packet injection or crafted capture file

When was CVE-2020-26422 disclosed?

CVE-2020-26422 was first published in the National Vulnerability Database on December 21, 2020, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2020-26422 actively exploited?

CVE-2020-26422 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 50.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2020-26422?

CVE-2020-26422 has a CVSS v3 base score of 3.7 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 5.3.

How do I remediate CVE-2020-26422?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-26422, 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

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CVE-2020-26422

📅 Published

🔄 Last Modified

🔗 References (10)