What’s Vulnerable › Vulnerabilities

CVE-2021-37147: Request Smuggling - LF line ending

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-11-03 · updated 2026-06-17
• Weakness: CWE-20

Description

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.

Affected products

• Apache Software Foundation Apache Traffic Server: from 8.0.0 through 8.1.2; from 9.0.0 through 9.1.0
• Debian Linux: 10.0, 11.0

References

• https://lists.apache.org/thread/k01797hyncx53659wr3o72s5cvkc3164
• https://www.debian.org/security/2022/dsa-5153
• https://lists.apache.org/thread/k01797hyncx53659wr3o72s5cvkc3164
• https://www.debian.org/security/2022/dsa-5153

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