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CVE-2025-66366: Incorrect handling of unauthenticated downlink RRC Setup messages can cause the baseband to crash

0
Routine
HIGH n/aMITIGATEMITIGATEMITIGATE

CVE-2025-66366 is a high-severity flaw (CVSS n/a) affecting exynos 1280, exynos 1330, exynos 1380. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Incorrect handling of unauthenticated downlink RRC Setup messages can cause the baseband to crash

Why this priority

  • No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS scoren/a (High)
EPSS exploit chancen/a
CISA exploited listNo
WeaknessCWE-129
Published2026-11-05
Last modified2026-11-05
Publisher (CNA): samsungsemiconductor · Vendor: samsung semiconductor · Source: CVE Program record (NVD analysis pending)

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Last updated 2026-11-05 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

samsung semiconductor exynos 1280 MITIGATE
Affected: < July 2026
Fixed in: July 2026
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy exynos-1280 || rpm -q exynos-1280 || exynos-1280 --version
No fixed or unaffected release known
Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.
samsung semiconductor exynos 1330 MITIGATE
Affected: < July 2026
Fixed in: July 2026
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy exynos-1330 || rpm -q exynos-1330 || exynos-1330 --version
No fixed or unaffected release known
Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.
samsung semiconductor exynos 1380 MITIGATE
Affected: < July 2026
Fixed in: July 2026
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy exynos-1380 || rpm -q exynos-1380 || exynos-1380 --version
No fixed or unaffected release known
Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.
samsung semiconductor exynos 1480 MITIGATE
Affected: < July 2026
Fixed in: July 2026
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy exynos-1480 || rpm -q exynos-1480 || exynos-1480 --version
No fixed or unaffected release known
Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.
samsung semiconductor exynos 2400 MITIGATE
Affected: < July 2026
Fixed in: July 2026
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy exynos-2400 || rpm -q exynos-2400 || exynos-2400 --version
No fixed or unaffected release known
Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.
samsung semiconductor exynos 1580 MITIGATE
Affected: < July 2026
Fixed in: July 2026
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy exynos-1580 || rpm -q exynos-1580 || exynos-1580 --version
No fixed or unaffected release known
Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

Advisories and coverage

Research and news

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-2025-66366?

exynos 1280: mitigate or apply the listed mitigation; exynos 1330: mitigate or apply the listed mitigation; exynos 1380: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-66366 being exploited?

CVE-2025-66366 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-2025-66366 affect?

CVE-2025-66366 affects exynos 1280, exynos 1330, exynos 1380. Severity is high (CVSS n/a). Incorrect handling of unauthenticated downlink RRC Setup messages can cause the baseband to crash

How urgent is CVE-2025-66366?

Priority 0/100. No elevated risk signals yet.

Software pages

Samsung vulnerabilities

Related CVEs

References

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