PatchTheCVECVE-2022-26943: The Motorola MTM5000 series firmwares generate TETRA authentication challenges using a PRNG using a tick count
CVE-2022-26943 is a high-severity flaw (CVSS 8.8) affecting mtm5500 firmware, mtm5400 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
The Motorola MTM5000 series firmwares generate TETRA authentication challenges using a PRNG using a tick count register as its sole entropy source. Low boottime entropy and limited re-seeding of the pool renders the authentication challenge vulnerable to two attacks. First, due to the limited boottime pool entropy, an adversary can derive the contents of the entropy pool by an exhaustive search of possible values, based on an observed authenticat
Why this priority
- High severity
No fix is published yet: follow the downgrade or mitigation steps.
Risk facts
| CVSS score | 8.8 (High) |
| Attack vector | Adjacent network |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.4% (top 71%) |
| CISA exploited list | No |
| Weakness | CWE-338 |
| Published | 2023-10-19 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2022-26943?
mtm5500 firmware: mitigate or apply the listed mitigation; mtm5400 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2022-26943 being exploited?
CVE-2022-26943 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2022-26943 affect?
CVE-2022-26943 affects mtm5500 firmware, mtm5400 firmware. Severity is high (CVSS 8.8). The Motorola MTM5000 series firmwares generate TETRA authentication challenges using a PRNG using a tick count register as its sole entropy source. Low boottime entropy and limited re-seeding of the pool renders the authentication challenge
How urgent is CVE-2022-26943?
Priority 38/100. High severity
Related CVEs
- CVE-2022-27813 HIGH 8.1 MITIGATE MITIGATE Motorola MTM5000 series firmwares lack properly configured memory protection of pages shared between the OMAP-
- CVE-2022-26942 HIGH 8.2 MITIGATE MITIGATE The Motorola MTM5000 series firmwares lack pointer validation on arguments passed to trusted execution environ
- CVE-2022-26941 CRITICAL 9.6 MITIGATE MITIGATE A format string vulnerability exists in Motorola MTM5000 series firmware AT command handler for the AT+CTGL co