CVE-2022-22819Public exploit

Code execution via unchecked SB2 block count

Published Mar 23, 2022 · Updated Aug 3, 2024

Buffer overflow in NXP LPC55S66 and LPC55S69 ROM 1B allows attackers to execute non-persistent code via a crafted SB2 update. The ROM parser copies up to the untrusted m_keyBlobBlock value into a fixed global buffer before signature verification instead of stopping after the 128-byte header. Exploitation requires SB2 loading through ISP, SPI recovery, or the update ROM API; normal authenticated secure boot is not exposed.

CVSS severity7.8
High
EPSS probability1.40%
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 NXP LPC55S66 and LPC55S69 ROM 1B allows attackers to execute non-persistent code via a crafted SB2 update. The ROM parser copies up to the untrusted m_keyBlobBlock value into a fixed global buffer before signature verification instead of stopping after the 128-byte header. Exploitation requires SB2 loading through ISP, SPI recovery, or the update ROM API; normal authenticated secure boot is not exposed.

The record

CVE
CVE-2022-22819
Published
Mar 23, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 23, 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 vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P

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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1203Exploitation for Client Execution

Public exploit references

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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