Protocol vs scheme mismatch
Priority LOW 37CWE-20Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA.
Summary
Improper Input Validation vulnerability in header parsing of Apache Traffic Server allows an attacker to request secure resources. This issue affects Apache Traffic Server 8.0.0 to 9.1.2.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.02253 83rd 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
- No
- 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 | 8.0.0 to 9.1.2 | — | No fix listed | CNA |
- Apache Traffic Server VendorApache Affected 8.0.0 to 9.1.2 Fixed in — No fix listed CNA
CPE configurations NVD · 5
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:apache:traffic_server:*:*:*:*:*:*:*:* | 8.0.0 – 8.1.4; 9.0.0 – 9.1.2 | Vulnerable | Apache |
| cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* | 10.0 | Vulnerable | Debian |
| cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* | 11.0 | Vulnerable | Debian |
| cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:* | 35 | Vulnerable | Fedoraproject |
| cpe:2.3:o:fedoraproject:fedora:36:*:*:*:*:*:*:* | 36 | Vulnerable | Fedoraproject |
- cpe:2.3:a:apache:traffic_server:*:*:*:*:*:*:*:* Versions 8.0.0 – 8.1.4; 9.0.0 – 9.1.2 Vulnerable ·Apache
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* Versions 10.0 Vulnerable ·Debian
- cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* Versions 11.0 Vulnerable ·Debian
- cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:* Versions 35 Vulnerable ·Fedoraproject
- cpe:2.3:o:fedoraproject:fedora:36:*:*:*:*:*:*:* Versions 36 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 — DSA-5206
6 records Highest priority Priority LOW 6 LOW
Other records, highest priority first
- TI-2022-13674 HTTP/2 framing vulnerabilitiesPriority LOW 38
- TI-2022-13673 Improper HTTP/2 scheme and method validationPriority LOW 38
- TI-2022-10928 Insufficient Validation of HTTP/1.x HeadersPriority LOW 38
- Advisory ·
Apache Traffic Server — FEDORA-2022-9832c0c04b
5 records Highest priority Priority LOW 5 LOW
Other records, highest priority first
- TI-2022-13674 HTTP/2 framing vulnerabilitiesPriority LOW 38
- TI-2022-13673 Improper HTTP/2 scheme and method validationPriority LOW 38
- TI-2022-10928 Insufficient Validation of HTTP/1.x HeadersPriority LOW 38
Show 1 more group
- Advisory ·
Apache Traffic Server — FEDORA-2022-23043f5a0b
5 records Highest priority Priority LOW 5 LOW
Other records, highest priority first
- TI-2022-13674 HTTP/2 framing vulnerabilitiesPriority LOW 38
- TI-2022-13673 Improper HTTP/2 scheme and method validationPriority LOW 38
- TI-2022-10928 Insufficient Validation of HTTP/1.x HeadersPriority LOW 38
Timeline
- 2026-10-02 Threatist record created from CVE-2021-37150
- 2026-10-03 Alias added: GHSA-qp2r-xr6f-7jm8
References
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-2023-20588 Apache Traffic Server: Malformed http/2 frames can cause an abort CVSS 3.1HIGH 7.5
Sources
- CVE-2021-37150 · CVE Program
- CVE-2021-37150 · NVD
- FIRST EPSS
- GHSA-qp2r-xr6f-7jm8 · GitHub Advisory Database · CC BY 4.0
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