CVE-2023-39456

HIGHNVD 7.57.5—Elevated

7.5

Improper Input Validation vulnerability in Apache Traffic Server with malformed HTTP/2 frames.This issue affects Apache Traffic Server: from 9.0.0 through 9.2.2.

Users are recommended to upgrade to version 9.2.3, which fixes the issue.

CVSS v3: 7.5
EG Score: 7.5(medium)
EPSS: 98.9%
KEV: Not listed

Published

October 17, 2023

Last Modified

June 12, 2025

References (10)

security@apachehttps://lists.apache.org/thread/5py8h42mxfsn8l1wy6o41xwhsjlsd87q
security@apachehttps://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JIZSEFC3YKCGABA2BZW6ZJRMDZJMB7PJ/
security@apachehttps://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VHUHTSXLXGXS7JYKBXTA3VINUPHTNGVU/
security@apachehttps://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZKQSIKIAT5TJ3WSLU3RDBQ35YX4GY4V3/
security@apachehttps://www.debian.org/security/2023/dsa-5549
af854a3a-2127-422b-91ae-364da2661108https://lists.apache.org/thread/5py8h42mxfsn8l1wy6o41xwhsjlsd87q
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JIZSEFC3YKCGABA2BZW6ZJRMDZJMB7PJ/
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VHUHTSXLXGXS7JYKBXTA3VINUPHTNGVU/
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZKQSIKIAT5TJ3WSLU3RDBQ35YX4GY4V3/
af854a3a-2127-422b-91ae-364da2661108https://www.debian.org/security/2023/dsa-5549

Weakness Classification(1)

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

CWE-20Improper Input Validation

Data Freshness Timeline

(refreshed 9× in last 7d / 53× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

2026-06-23 21:31 UTCEPSS rescore
2026-06-23 21:31 UTCEPSS rescore
2026-06-21 01:58 UTCEPSS rescore
2026-06-21 01:58 UTCEPSS rescore
2026-06-19 19:24 UTCEPSS rescore
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2026-06-18 17:51 UTCEPSS rescore
2026-06-17 17:51 UTCEPSS rescore
2026-06-17 17:51 UTCEPSS rescore
2026-06-16 17:51 UTCEPSS rescore
2026-06-16 17:51 UTCEPSS rescore
2026-06-15 17:47 UTCEPSS rescore
2026-06-15 17:47 UTCEPSS rescore
2026-06-14 23:16 UTCEPSS rescore
2026-06-13 22:59 UTCEPSS rescore
2026-06-13 22:59 UTCEPSS rescore
2026-06-12 23:10 UTCEPSS rescore
2026-06-12 23:10 UTCEPSS rescore
2026-06-11 13:59 UTCEPSS rescore
2026-06-11 13:59 UTCEPSS rescore
2026-06-10 22:17 UTCEPSS rescore
2026-06-10 13:21 UTCEPSS rescore
2026-06-10 13:21 UTCEPSS rescore
2026-06-09 17:47 UTCOSV refresh
2026-06-08 14:16 UTCEPSS rescore

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2026-06-08 14:16 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-05 22:46 UTCEPSS rescore
2026-06-05 22:46 UTCEPSS rescore
2026-06-05 06:09 UTCEPSS rescore
2026-06-05 06:09 UTCEPSS rescore
2026-06-05 06:09 UTCEPSS rescore
2026-06-04 13:11 UTCEPSS rescore
2026-06-04 13:11 UTCEPSS rescore
2026-06-02 20:12 UTCEPSS rescore
2026-06-02 20:12 UTCEPSS rescore
2026-06-01 13:51 UTCEPSS rescore
2026-06-01 13:51 UTCEPSS rescore
2026-05-31 22:30 UTCEPSS rescore
2026-05-31 22:29 UTCEPSS rescore
2026-05-31 00:15 UTCEPSS rescore
2026-05-31 00:15 UTCEPSS rescore
2026-05-29 13:43 UTCEPSS rescore
2026-05-29 13:43 UTCEPSS rescore
2026-05-28 13:44 UTCEPSS rescore
2026-05-28 13:43 UTCEPSS rescore
2026-05-27 13:39 UTCEPSS rescore
2026-05-27 13:39 UTCEPSS rescore
2026-05-26 13:43 UTCEPSS rescore
2026-05-26 13:43 UTCEPSS rescore
2026-05-24 15:41 UTCEG score recompute
2026-05-24 15:41 UTCGHSA enrichment
2026-05-23 17:35 UTCOSV refresh

Frequently asked(5)

What is CVE-2023-39456?

CVE-2023-39456 is a high vulnerability published on October 17, 2023. Improper Input Validation vulnerability in Apache Traffic Server with malformed HTTP/2 frames.This issue affects Apache Traffic Server: from 9.0.0 through 9.2.2. Users are recommended to upgrade to version 9.2.3, which fixes the issue.

When was CVE-2023-39456 disclosed?

CVE-2023-39456 was first published in the National Vulnerability Database on October 17, 2023, with the most recent update on June 12, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2023-39456 actively exploited?

CVE-2023-39456 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 98.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2023-39456?

CVE-2023-39456 has a CVSS v3 base score of 7.5 (NVD).

How do I remediate CVE-2023-39456?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-39456, 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-2023-39456

📅 Published

🔄 Last Modified

🔗 References (10)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2023-39456?

🔗 Related CVEs(same CWE)

Same CWE

Published

Last Modified

References (10)

Frequently asked(5)

Related CVEs(same CWE)