PatchTheCVECVE-2026-21047: Out-of-bounds write in ImsService prior to SMR Jul-2026 Release 1 allows remote attackers to potentially execu
CVE-2026-21047 is a high-severity flaw (CVSS 8.3) affecting affected software. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Out-of-bounds write in ImsService prior to SMR Jul-2026 Release 1 allows remote attackers to potentially execute arbitrary code.
Why this priority
- High severity
- CISA SSVC: automatable with total technical impact
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 8.3 (High) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.7% (top 49%) |
| CISA exploited list | No |
| Weakness | CWE-787 |
| Published | 2026-07-28 |
| Last modified | 2026-10-24 |
Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Timeline
- Published CVE record published
- Updated Record last modified
Exact fixes by distribution
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-2026-21047?
No fixed release is listed yet. Watch the vendor advisory and apply any mitigation shown on this page.
Is CVE-2026-21047 being exploited?
CVE-2026-21047 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-2026-21047 affect?
CVE-2026-21047 affects affected software. Severity is high (CVSS 8.3). Out-of-bounds write in ImsService prior to SMR Jul-2026 Release 1 allows remote attackers to potentially execute arbitrary code.
How urgent is CVE-2026-21047?
Priority 50/100. High severity; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action