CVE-2022-32295Network attack vector

Guest-level firmware writes via recoverable SMC seed

Published Jun 30, 2022 · Updated Aug 3, 2024

Improper access control in Ampere Altra before SRP 1.09 and Altra Max before SRP 2.10 allows guest OS users to write SPI-NOR via SMC. The SPI-NOR proxy exposes UEFI persistent storage without understanding its contents, while seed-hash authentication lets an untrusted hypervisor recover the SMC seed by scanning the UEFI data segment. Reachability requires a bare-metal deployment with an untrusted hypervisor; successful writes can alter persistent UEFI storage.

CVSS severity5.3
Medium
EPSS probability1.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in Ampere Altra before SRP 1.09 and Altra Max before SRP 2.10 allows guest OS users to write SPI-NOR via SMC. The SPI-NOR proxy exposes UEFI persistent storage without understanding its contents, while seed-hash authentication lets an untrusted hypervisor recover the SMC seed by scanning the UEFI data segment. Reachability requires a bare-metal deployment with an untrusted hypervisor; successful writes can alter persistent UEFI storage.

The record

CVE
CVE-2022-32295
Published
Jun 30, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1542.001, T1495
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 30, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.3Ampere ComputingCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N
7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1542.001Pre-OS Boot: System Firmware
T1495Firmware Corruption

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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