PatchTheCVECVE-2025-20727: In Modem, there is a possible out of bounds write due to a heap buffer overflow
CVE-2025-20727 is a high-severity flaw (CVSS 8.1) affecting lr12a, nr15, nr16. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
In Modem, there is a possible out of bounds write due to a heap buffer overflow. This could lead to remote escalation of privilege, if a UE has connected to a rogue base station controlled by the attacker, with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: MOLY01672601; Issue ID: MSV-4623.
Why this priority
- High severity
- Remotely exploitable, no login, no user action
No fix is published yet: follow the downgrade or mitigation steps.
Risk facts
| CVSS score | 8.1 (High) |
| Attack vector | Network (remote) |
| Attack complexity | High |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.6% (top 53%) |
| CISA exploited list | No |
| Weakness | CWE-787 |
| Published | 2025-11-04 |
| 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-2025-20727?
lr12a: mitigate or apply the listed mitigation; nr15: mitigate or apply the listed mitigation; nr16: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2025-20727 being exploited?
CVE-2025-20727 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-2025-20727 affect?
CVE-2025-20727 affects lr12a, nr15, nr16. Severity is high (CVSS 8.1). In Modem, there is a possible out of bounds write due to a heap buffer overflow. This could lead to remote escalation of privilege, if a UE has connected to a rogue base station controlled by the attacker, with no additional execution privi
How urgent is CVE-2025-20727?
Priority 45/100. High severity; Remotely exploitable, no login, no user action
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