- Exploited
- No known exploitation
- Fix
- Fixed in July 2026
- Who is exposed
- Not reported
Do first: Upgrade to a fixed version: July 2026.
- Last modified
- FIRST's estimate of the chance attackers exploit it in the next 30 days, updated daily.What do these mean? →
- 0.14% · 3rd percentile
- A 0-100 score for how much a CVE matters across the industry: exploitation, exposure, how widely the software is used, severity and whether a fix exists.What do these mean? →
- 0/100 · provisional
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
The baseband, the component that handles cellular radio communication, mishandles unauthenticated downlink RRC Setup messages, which can cause it to crash. An attacker who can send such messages can disrupt the affected device's cellular connectivity.
Written by anthropic/claude-haiku-5.5 from the sources below. Verify against them.
Read the original description
Incorrect handling of unauthenticated downlink RRC Setup messages can cause the baseband to crash
cve.now Index
- Exploitation?/40Unknown. No CISA SSVC exploitation rating yet
- Exposure?/25Unknown. No advisory context yet
- Reach?/20Unknown. No tracked technology or package matched
- Severity?/10Unknown. No CVSS score or vendor rating
- No patch0/5No signal
What would change the score
- Would score about 55 if added to CISA KEV
- Would score about 50 if CISA's SSVC rates exploitation active
- Would score about 22 if advisories confirm default setups are exposed
What to do
Upgrade to a fixed version: July 2026.
Timeline
- CVE published
- First seen by cve.now
Affected versions
- Samsung Semiconductor Exynos 1280
fixed in July 2026
- Samsung Semiconductor Exynos 1330
fixed in July 2026
- Samsung Semiconductor Exynos 1380
fixed in July 2026
- Samsung Semiconductor Exynos 1480
fixed in July 2026
- Samsung Semiconductor Exynos 2400
fixed in July 2026
- Samsung Semiconductor Exynos 1580
fixed in July 2026
- Samsung Semiconductor Exynos 2500
fixed in July 2026
- Samsung Semiconductor Exynos Modem 5300
fixed in July 2026
Show all 10 packagesShow fewer packages
- Samsung Semiconductor Exynos Modem 5400
fixed in July 2026
- Samsung Semiconductor Exynos Modem 5410
fixed in July 2026
Evidence 1
- Link
Corrections
None so far.
Something wrong on this page? Report an error. Every fix is listed here.
Questions about CVE-2025-66366
Is CVE-2025-66366 being exploited?
It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.Source: cve.now feed data
Which versions are affected by CVE-2025-66366?
Exynos 1280: before July 2026. Exynos 1330: before July 2026. Exynos 1380: before July 2026. Exynos 1480: before July 2026. Exynos 2400: before July 2026. 5 more packages are listed on the page.Source: cve.now feed data
How do I fix CVE-2025-66366?
Upgrade to a fixed version: July 2026.Source: cve.now feed data