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TI-2021-15213 Aliases CVE-2021-37147GHSA-2c64-8v4j-vw3m

Request Smuggling - LF line ending

Priority LOW 38CWE-20Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · High · 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 smuggle requests. This issue affects Apache Traffic Server 8.0.0 to 8.1.2 and 9.0.0 to 9.1.0.

Why it matters now

EPSS 0.02519 84th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
ApacheApache Traffic Server8.0.0 to 8.1.2 and 9.0.0 to 9.1.0—No fix listedCNA
  • Apache Traffic Server VendorApache Affected 8.0.0 to 8.1.2 and 9.0.0 to 9.1.0 Fixed in — No fix listed CNA

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:a:apache:traffic_server:*:*:*:*:*:*:*:*8.0.0 – 8.1.2; 9.0.0 – 9.1.0VulnerableApache
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*10.0VulnerableDebian
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*11.0VulnerableDebian
  • cpe:2.3:a:apache:traffic_server:*:*:*:*:*:*:*:* Versions 8.0.0 – 8.1.2; 9.0.0 – 9.1.0 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

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-37147
  2. 2026-10-03 Alias added: GHSA-2c64-8v4j-vw3m

References

Patch 1

Advisory 1

  • 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
See all 120 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences