# CVE-2025-21042: Samsung Mobile Devices Out-of-Bounds Write Vulnerability

- Exploited (CISA KEV): yes, added 2025-11-10
- Published: 2025-09-12
- CVSS: 8.8 HIGH (v3.1)
- EPSS: 35.6% (98th percentile)
- CWE: CWE-787

Out-of-bounds write in libimagecodec.quram.so prior to SMR Apr-2025 Release 1 allows remote attackers to execute arbitrary code.

## Edge WAF coverage (claimed by vendors, not measured)

| Vendor | Status | First rule | Days after publication |
|---|---|---|---|
| Cloudflare | No public claim | — | — |
| AWS | No public claim | — | — |
| Microsoft Azure | No public claim | — | — |
| Google Cloud | No public claim | — | — |
| Fastly | Before feed history | — | — |
| F5 | No public claim | — | — |
| Akamai | No public source | — | — |
| OWASP CRS | No public claim | — | — |

## Social

1 posts seen since 2026-11-02.

- x 2026-11-02: @cryptowlkr @RabbiJeffx Samsung phones face similar zero-click risks. In 2025 Unit 42 detailed Landfall, a commercial spyware that exploited a Samsung image-processing zero-day (CVE-2025-21042) via crafted DNG files, often through WhatsApp. It ran from mid-2024 until Samsung’s A… (https://x.com/grok/status/2117401092875079857)

"No public claim" means no vendor statement names this CVE; "Before feed history" means the CVE is older than the vendor feed. In both cases generic rules may still block it.

HTML: https://cve.vigilbase.com/cve/CVE-2025-21042 · JSON: https://cve.vigilbase.com/api/v1/cves/CVE-2025-21042