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CVE-2021-38161

Not validating origin TLS certificate

8.1 HighFix available

Improper Authentication vulnerability in TLS origin verification of Apache Traffic Server allows for man in the middle attacks. This issue affects Apache Traffic Server 8.0.0 to 8.0.8.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
High
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

1.95%Up 1.5 points since Nov 4, 2021
90%50%10%1%

What each source reports

NVD Score used8.1

Improper Authentication vulnerability in TLS origin verification of Apache Traffic Server allows for man in the middle attacks. This issue affects Apache Traffic Server 8.0.0 to 8.0.8.

Record
CVE-2021-38161
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0
6.8 MediumAV:N/AC:M/Au:N/C:P/I:P/A:P
Weakness
CWE-287
Updated
2026-11-02
CVE ListNo score

Not validating origin TLS certificate

Improper Authentication vulnerability in TLS origin verification of Apache Traffic Server allows for man in the middle attacks. This issue affects Apache Traffic Server 8.0.0 to 8.0.8.

Record
CVE-2021-38161
Weakness
CWE-287
Updated
2026-11-02
EUVDEUVD-2021-24631No score

Improper Authentication vulnerability in TLS origin verification of Apache Traffic Server allows for man in the middle attacks. This issue affects Apache Traffic Server 8.0.0 to 8.0.8.

Record
EUVD-2021-24631
Updated
2026-11-03
GitHub AdvisoriesGHSA-wp25-8fm6-33wm8.1

Improper Authentication vulnerability in TLS origin verification of Apache Traffic Server allows...

Improper Authentication vulnerability in TLS origin verification of Apache Traffic Server allows for man in the middle attacks. This issue affects Apache Traffic Server 8.0.0 to 8.0.8.

Record
GHSA-wp25-8fm6-33wm
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-287
Updated
2026-11-02
OSV8.1

Improper Authentication vulnerability in TLS origin verification of Apache Traffic Server allows for man in the middle attacks. This issue affects Apache Traffic Server 8.0.0 to 8.0.8.

Record
CVE-2021-38161
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVDEBIAN-CVE-2021-381618.1

Improper Authentication vulnerability in TLS origin verification of Apache Traffic Server allows for man in the middle attacks. This issue affects Apache Traffic Server 8.0.0 to 8.0.8.

Record
DEBIAN-CVE-2021-38161
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2021-381618.1

Improper Authentication vulnerability in TLS origin verification of Apache Traffic Server allows for man in the middle attacks. This issue affects Apache Traffic Server 8.0.0 to 8.0.8.

Record
UBUNTU-CVE-2021-38161
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
trafficserver
Debian:12
before 9.1.0+ds-1
9.1.0+ds-1
trafficserver
Debian:10
From an advisory covering 6 CVEs
before 8.0.2+ds-1+deb10u6, 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+deb10u48.0.2+ds-1+deb10u5
8.0.2+ds-1+deb10u6
trafficserver
Debian:11
From an advisory covering 6 CVEs
before 8.1.1+ds-1.1+deb11u1, plus listed versions
8.1.1+ds-1.1
8.1.1+ds-1.1+deb11u1
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
trafficserver
Ubuntu:Pro:22.04:LTS
All versions, plus listed versions
8.1.1+ds-1.19.1.1+ds-2build19.1.1+ds-2ubuntu0.1~esm19.1.1+ds-2ubuntu0.19.1.1+ds-2ubuntu0.1+esm1
None known

History

History
RecordedChangedSources
affected, facts
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

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

In short

CVE-2021-38161 is a high vulnerability (CVSS 8.1) in Apache Traffic Server, published November 3, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.95%, the 80th percentile. Fixed in trafficserver 9.1.0+ds-1.

References

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