DCK pinning attack in TETRA

published 2023-10-19 3 y ago modified 2026-06-17 4 mo ago also EUVD-2022-29292

cvss: 7.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 19%
public exploits: 0; none known

A flaw in the TETRA authentication procecure allows a MITM adversary that can predict the MS challenge RAND2 to set session key DCK to zero.

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 2 y ago (2024-09-12)

Exploit prediction

0.27% chance of exploitation in the next 30 days, higher than 19% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	7.5	CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:U/RC:R/CR:H/IR:H/AR:H/MAV:A/MAC:H/MPR:N/MUI:N/MS:U/MC:H/MI:H/MA:H
CNA	3.1	7.5	CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	3.1	5.9	CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N

Affected products

ETSI TETRA Standard

Classification

Weakness

CWE-807 Reliance on Untrusted Inputs in a Security Decision
CWE-639 Authorization Bypass Through User-Controlled Key

References

tetraburst.com /
related, vendor-advisory

Sources

CVE List CVE-2022-24400
NVD CVE-2022-24400

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Summary