Apache Traffic Server: Malformed http/2 frames can cause an abort
Priority HIGH 73CWE-20Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.58286 99th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Apache | Apache Traffic Server | 9.0.0 – 9.2.2 | — | No fix listed | CNA |
- Apache Traffic Server VendorApache Affected 9.0.0 – 9.2.2 Fixed in — No fix listed CNA
CPE configurations NVD · 3
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:apache:traffic_server:*:*:*:*:*:*:*:* | 9.0.0 to before 9.2.3 | Vulnerable | Apache |
| cpe:2.3:o:fedoraproject:fedora:37:*:*:*:*:*:*:* | 37 | Vulnerable | Fedoraproject |
| cpe:2.3:o:fedoraproject:fedora:38:*:*:*:*:*:*:* | 38 | Vulnerable | Fedoraproject |
- cpe:2.3:a:apache:traffic_server:*:*:*:*:*:*:*:* Versions 9.0.0 to before 9.2.3 Vulnerable ·Apache
- cpe:2.3:o:fedoraproject:fedora:37:*:*:*:*:*:*:* Versions 37 Vulnerable ·Fedoraproject
- cpe:2.3:o:fedoraproject:fedora:38:*:*:*:*:*:*:* Versions 38 Vulnerable ·Fedoraproject
Remediation
No fixed version listed by the sources yet.
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Advisory ·
Apache Traffic Server — lists.apache.org/thread/5py8h42mxfsn8l1wy6o41xwhsjlsd87q
2 records Highest priority Priority HIGH 1 HIGH, 1 MEDIUM
Other records, highest priority first
- TI-2023-22167 Apache Traffic Server: s3_auth plugin problem with hash calculationPriority MEDIUM 42
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2023-39456
- 2026-10-03 Alias added: GHSA-fr7h-j3xj-fvvv
- 2026-10-12 EPSS moved to the 99th percentile and above
References
Other 4
- https://lists.fedoraproject.org/archives/list/[email protected]/message/ZKQSIKIAT5TJ3WSLU3RDBQ35YX4GY4V3/
- https://lists.fedoraproject.org/archives/list/[email protected]/message/JIZSEFC3YKCGABA2BZW6ZJRMDZJMB7PJ/
- https://lists.fedoraproject.org/archives/list/[email protected]/message/VHUHTSXLXGXS7JYKBXTA3VINUPHTNGVU/
- https://www.debian.org/security/2023/dsa-5549
More Apache Traffic Server vulnerabilities
- TI-2023-23979 The HTTP/2 protocol allows a denial of service (server resource consumption) because… KEVCVSS 3.1HIGH 7.5
- TI-2024-20685 Apache Traffic Server: HTTP/2 CONTINUATION frames can be utilized for DoS attack CVSS 3.1HIGH 7.5
- TI-2019-06950 Some HTTP/2 implementations are vulnerable to a settings flood, potentially leading to a… CVSS 3.1HIGH 7.5
- TI-2019-06949 Some HTTP/2 implementations are vulnerable to a reset flood, potentially leading to a… CVSS 3.1HIGH 7.5
- TI-2019-06947 Some HTTP/2 implementations are vulnerable to ping floods, potentially leading to a… CVSS 3.1HIGH 7.5
- TI-2019-06948 Some HTTP/2 implementations are vulnerable to resource loops, potentially leading to a… CVSS 3.1HIGH 7.5
Sources
- CVE-2023-39456 · CVE Program
- CVE-2023-39456 · NVD
- FIRST EPSS
- GHSA-fr7h-j3xj-fvvv · GitHub Advisory Database · CC BY 4.0
- CVE-2023-39456 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences