CVE-2025-61971Disclosure

LOWCVSS 5.9 · MEDIUM

Exploit discussion active in current signal (1 latest mentions)

Immediate actions

Hunt for exploitation attempts and persistence artifacts
Increase monitoring for publicly documented tradecraft
Track advisory updates for patch or workaround availability

Recommended action window: High priority (within 72h)

NVD description

Missing lock bit protection for NBIO registers could allow a local admin-privileged attacker to modify MMIO routing configurations, potentially resulting in loss of SEV-SNP guest integrity.

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1.5/ 10 priority

Sources & remediation

Other references

https://www.amd.com/en/resources/product-security/bulletin/AMD-SB-3030.html

Weakness type (CWE)

CWE-1233

Priority

LOW

Exploitation

NONE

PoC

YES

Patch

NONE

Momentum

NONE

Threat summary

Public PoC is present in monitored signal
1 mentions across 1 observed day

What's happening

PoC mentioned or linked in 1 signal
Technical details provided in 1 signal
Disclosure: 1 classified signal
1 total mentions across 1 day

Deep dive

Activity timeline1 mentions / 1d

Signal classification1 categories

Disclosure

1100.0%

Referenced assets1 URL

By indicator

https://xca-attacks.github.io

Full discourse1 post

Shweta Shinde@shw3ta_shinde151d
Disclosure
BreakFAST is a confused-deputy attack on the AMD Infinity Fabric that breaks SEV-SNP. After Fabricked, 2nd instance of a broader family: Interconnect Corruption Attacks (XCA). CVE-2025-61971 and CVE-2025-61972 (CVSS Score 8.5) https://xca-attacks.github.io #ConfidentialComputing #AMD
Post summary
New AMD Infinity Fabric SEV‑SNP vulnerability disclosed (CVE‑2025‑61971 & CVE‑2025‑61972) with a CVSS of 8.5, part of the Interconnect Corruption Attacks family, link provided for details.
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