CVE-2022-21672Network attack vector

Man-in-the-middle interception via unfiltered trust extraction

Published Jan 10, 2022 · Updated Apr 23, 2025

Input misinterpretation in Linux From Scratch make-ca 0.9 through 1.9 allows man-in-the-middle attackers to intercept trusted TLS traffic. The script invokes p11-kit trust extraction without restricting output to CA anchors, so PEM bundles include certificates Mozilla marks as explicitly distrusted. Exploitation requires a network interception position and a certificate accepted through the corrupted bundle, enabling impersonation of TLS peers for applications that consume it.

CVSS severity6.5
Medium
EPSS probability0.71%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Input misinterpretation in Linux From Scratch make-ca 0.9 through 1.9 allows man-in-the-middle attackers to intercept trusted TLS traffic. The script invokes p11-kit trust extraction without restricting output to CA anchors, so PEM bundles include certificates Mozilla marks as explicitly distrusted. Exploitation requires a network interception position and a certificate accepted through the corrupted bundle, enabling impersonation of TLS peers for applications that consume it.

The record

CVE
CVE-2022-21672
Published
Jan 10, 2022
Updated
Apr 23, 2025
Vendor
Linux From Scratch
Product
make-ca
Classifications
CWE-115, T1557
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Jan 10, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 23, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 0.9, < 1.10

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

Linux From Scratch · make-caversion=>= 0.9, < 1.10

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
6.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-115Misinterpretation of Input
T1557Adversary-in-the-Middle

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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