CVE-2022-26943

Authentication compromise via predictable PRNG challenges

Published Oct 19, 2023 · Updated Aug 3, 2024

Weak PRNG use in Motorola Solutions MTM5000 Series Firmware allows physically proximate attackers to predict TETRA authentication challenges. The firmware seeds its authentication-challenge generator solely from a tick-count register, with little boot-time entropy and limited pool reseeding, so an observed challenge permits exhaustive recovery of the entropy-pool state. Radio-range access and an observed challenge are sufficient to predict later challenges, enabling authentication compromise, uplink interception, and access to post-authentication protocol functions.

CVSS severity8.8
High
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Weak PRNG use in Motorola Solutions MTM5000 Series Firmware allows physically proximate attackers to predict TETRA authentication challenges. The firmware seeds its authentication-challenge generator solely from a tick-count register, with little boot-time entropy and limited pool reseeding, so an observed challenge permits exhaustive recovery of the entropy-pool state. Radio-range access and an observed challenge are sufficient to predict later challenges, enabling authentication compromise, uplink interception, and access to post-authentication protocol functions.

The record

CVE
CVE-2022-26943
Published
Oct 19, 2023
Updated
Aug 3, 2024
Vendor
Motorola Solutions
Product
MTM5000 Series Firmware
Classifications
CWE-338, T1040
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 19, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=0 <*

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Motorola Solutions · MTM5000 Series Firmwareversion=0 <*

Published CVSS scores

8.8NCSC-NLCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

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

Weakness, pattern, technique

CWE-338Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)
T1040Network Sniffing

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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