CVE-2021-32565

HTTP Request Smuggling, content length with invalid charters

7.5 HighFix available

Invalid values in the Content-Length header sent to Apache Traffic Server allows an attacker to smuggle requests. This issue affects Apache Traffic Server 7.0.0 to 7.1.12, 8.0.0 to 8.1.1, 9.0.0 to 9.0.1.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: High
Availability: None

Exploit likelihood

2.14%Up 1.7 points since Jun 30, 2021

What each source reports

NVD Score used 7.5

Record: CVE-2021-32565
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CVSS 2.0: 5.0 MediumAV:N/AC:L/Au:N/C:N/I:P/A:N
Weakness: CWE-444
Updated: 2026-11-02

CVE List No score

HTTP Request Smuggling, content length with invalid charters

Record: CVE-2021-32565
Weakness: CWE-444
Updated: 2026-11-02

EUVDEUVD-2021-19407 No score

Record: EUVD-2021-19407
Updated: 2026-11-03

GitHub AdvisoriesGHSA-mpgf-5wcr-9hgg No score

Invalid values in the Content-Length header sent to Apache Traffic Server allows an attacker to...

Record: GHSA-mpgf-5wcr-9hgg
Weakness: CWE-444
Updated: 2026-11-02

OSV 7.5

Record: CVE-2021-32565
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Updated: 2026-11-02

OSVDEBIAN-CVE-2021-32565 7.5

Record: DEBIAN-CVE-2021-32565
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Updated: 2026-11-02

OSVUBUNTU-CVE-2021-32565 7.5

Record: UBUNTU-CVE-2021-32565
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`trafficserver` Debian:12	before 8.1.1+ds-1.1	8.1.1+ds-1.1
`trafficserver` Debian:10 From an advisory covering 5 CVEs	before 8.0.2+ds-1+deb10u5, plus listed versions 8.0.2+ds-18.0.2+ds-1+deb10u18.0.2+ds-1+deb10u28.0.2+ds-1+deb10u38.0.2+ds-1+deb10u4	8.0.2+ds-1+deb10u5
`trafficserver` Ubuntu:16.04:LTS	All versions, plus listed versions 5.3.0-2ubuntu15.3.0-2ubuntu2	None known
`trafficserver` Ubuntu:18.04:LTS	All versions, plus listed versions 7.0.0-57.1.2+ds-27.1.2+ds-2build17.1.2+ds-3	None known
`trafficserver` Ubuntu:Pro:20.04:LTS	All versions, plus listed versions 8.0.5+ds-18.0.5+ds-28.0.5+ds-2build18.0.5+ds-2ubuntu18.0.5+ds-38.0.5+ds-3ubuntu0.1~esm1	None known

History

History
Recorded	Changed	Sources
Nov 6, 2026	affected, facts
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-32565 is a high vulnerability (CVSS 7.5) in Apache Traffic Server, published June 29, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.14%, the 82nd percentile. Fixed in trafficserver 8.1.1+ds-1.1.

References

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