CVE-2022-38692Network attack vector

Code execution via oversized Certificate Type 0 key

Published Sep 1, 2025 · Updated Sep 1, 2025

Buffer overflow in UNISOC BootROM allows attackers to execute code via an oversized RSA key in a Certificate Type 0 boot image. The RSA byte-swap routine copies keys over 2048 bits into fixed 256-byte g_n and g_sig buffers, corrupting the BootROM stack. Reachability requires control of a second-stage image in regular or recovery boot; exploitation provides persistent BootROM-context code execution.

CVSS severity9.8
Critical
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in UNISOC BootROM allows attackers to execute code via an oversized RSA key in a Certificate Type 0 boot image. The RSA byte-swap routine copies keys over 2048 bits into fixed 256-byte g_n and g_sig buffers, corrupting the BootROM stack. Reachability requires control of a second-stage image in regular or recovery boot; exploitation provides persistent BootROM-context code execution.

The record

CVE
CVE-2022-38692
Published
Sep 1, 2025
Updated
Sep 1, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-119, T1542.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 1, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 1, 2025Record 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 privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8CISA-ADPCVSS: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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T1542.001Pre-OS Boot: System Firmware

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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