CVE-2022-24402: The TETRA TEA1 keystream generator implements a key register initialization function that compresses the 80-bi

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HIGH 8.8DOWNGRADE

CVE-2022-24402 is a high-severity flaw (CVSS 8.8) affecting tetra\. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The TETRA TEA1 keystream generator implements a key register initialization function that compresses the 80-bit key to only 32 bits for usage during the keystream generation phase, which is insufficient to safeguard against exhaustive search attacks.

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	0.6% (top 51%)
CISA exploited list	No
Weakness	CWE-334, CWE-307
Published	2023-10-19
Last modified	2026-06-17

Publisher (CNA): National Cyber Security Centre Netherlands (NCSC-NL) · Vendor: midnightblue

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-10-19 10:15 UTCPublished CVE record published
2026-06-17 04:31 UTCUpdated Record last modified

midnightblue tetra\ DOWNGRADE

Affected: burst

Fixed in: no fixed release known

Safe to downgrade to: a release before burst

1. Check installed version

apt-cache policy tetra || rpm -q tetra || tetra --version

2. No fixed release: DOWNGRADE to a release before burst (Debian / Ubuntu)

apt-cache madison tetra sudo apt install tetra=<VERSION_BEFORE_burst> sudo apt-mark hold tetra

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list tetra sudo dnf downgrade tetra-<VERSION_BEFORE_burst> sudo dnf versionlock add tetra

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
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-2022-24402?

tetra\: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2022-24402 being exploited?

CVE-2022-24402 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-2022-24402 affect?

CVE-2022-24402 affects tetra\. Severity is high (CVSS 8.8). The TETRA TEA1 keystream generator implements a key register initialization function that compresses the 80-bit key to only 32 bits for usage during the keystream generation phase, which is insufficient to safeguard against exhaustive searc

How urgent is CVE-2022-24402?

Priority 43/100. High severity

Related CVEs

CVE-2022-24404 MEDIUM 5.9 DOWNGRADE Lack of cryptographic integrity check on TETRA air-interface encrypted traffic
CVE-2022-24403 MEDIUM 4.3 DOWNGRADE The TETRA TA61 identity encryption function internally uses a 64-bit value derived exclusively from the SCK (C
CVE-2022-24401 HIGH 8.8 DOWNGRADE Adversary-induced keystream re-use on TETRA air-interface encrypted traffic using any TEA keystream generator
CVE-2022-24400 HIGH 7.5 DOWNGRADE A flaw in the TETRA authentication procecure allows a MITM adversary that can predict the MS challenge RAND2 t

References

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