# CVE-2025-62621: AMD Secure Encrypted Virtualization firmware expected behavior violation in RMP

Source: https://junglewise.ai/threats/cve-2025-62621-expected-behavior-violation-in-amd-secure-encrypted  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-10. Updated: 2026-11-10  
License: CC BY 4.0 with a link back

CVE-2025-62621 · Severity: info · Published 2026-11-10

AMD's Secure Encrypted Virtualization (SEV) is a firmware feature that encrypts virtual machine memory to protect guest data from a potentially compromised hypervisor. A flaw in the Reverse Map Table (RMP) protection mechanism could allow a malicious hypervisor to compromise guest memory integrity in SEV-SNP systems, undermining the core security guarantee of guest isolation.

Technologies: [Amd Secure Encrypted Virtualization firmware](https://junglewise.ai/threats/technologies/secure-encrypted-virtualization-firmware). Vendors: [Amd](https://junglewise.ai/threats/vendors/amd).

## Quick answers

**Is CVE-2025-62621 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-62621 being exploited in the wild.

**How severe is CVE-2025-62621?** Informational severity, published 10 November 2026.

**Which products and versions are affected?** AMD Secure Encrypted Virtualization firmware.

**Is there a fix for CVE-2025-62621?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2025-62621 attacked?** It is attacked with local access, in device firmware.

**Am I affected by CVE-2025-62621?** Check whether you run Amd Secure Encrypted Virtualization firmware. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

This vulnerability is an expected behavior violation in AMD SEV firmware affecting the Reverse Map Table (RMP) enforcement mechanism. A malicious hypervisor can bypass RMP protections through an unspecified attack vector, potentially compromising SEV-SNP guest memory integrity. The issue requires hypervisor-level control and affects the firmware-level enforcement of memory access controls.

## Affected products

- AMD Secure Encrypted Virtualization firmware

## Timeline

- 2026-11-10: advisory

## References

- [https://www.amd.com/en/resources/product-security/bulletin/AMD-SB-3037.html](https://www.amd.com/en/resources/product-security/bulletin/AMD-SB-3037.html)

## Related threats

- [AMD Secure Encrypted Virtualization firmware missing authentication](https://junglewise.ai/threats/cve-2026-0480-missing-authentication-for-critical-function-in-amd-secure)
- [AMD Secure Encrypted Virtualization firmware out-of-bounds write](https://junglewise.ai/threats/cve-2026-0454-an-out-of-bounds-write-in-the-amd-secure-encrypted-virtualization)
- [AMD Secure Encrypted Virtualization use-after-free in firmware](https://junglewise.ai/threats/cve-2025-48504-operation-on-a-resource-after-expiration-or-release-in-the-secure)
- [AMD Secure Encrypted Virtualization firmware authentication bypass](https://junglewise.ai/threats/cve-2026-40668-authentication-bypass-by-spoofing-in-amd-secure-encrypted)
- [AMD Secure Encrypted Virtualization firmware resource reuse](https://junglewise.ai/threats/cve-2025-52535-improper-resource-reuse-in-the-amd-secure-encrypted)