CVE-2023-6129Network attack vector

Application state corruption via reversed register restoration

Published Jan 9, 2024 · Updated May 12, 2026

Out-of-bounds write in affected OpenSSL 3.x releases allows remote attackers to corrupt application state through POLY1305 use. The PowerPC POLY1305 assembly restores saved vector registers in a different order, overwriting nonvolatile register contents on PowerISA 2.07 processors. Reachability requires attacker influence over POLY1305 selection, such as CHACHA20-POLY1305 on a TLS server; outcomes range from incorrect calculations to an application crash.

CVSS severity6.5
Medium
EPSS probability2.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in affected OpenSSL 3.x releases allows remote attackers to corrupt application state through POLY1305 use. The PowerPC POLY1305 assembly restores saved vector registers in a different order, overwriting nonvolatile register contents on PowerISA 2.07 processors. Reachability requires attacker influence over POLY1305 selection, such as CHACHA20-POLY1305 on a TLS server; outcomes range from incorrect calculations to an application crash.

The record

CVE
CVE-2023-6129
Published
Jan 9, 2024
Updated
May 12, 2026
Vendor
Siemens
Product
SINEC NMS
Classifications
CWE-787, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 9, 2024CVE publishedPublication date reported by the CVE source.
  2. May 12, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <V3.0 SP1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Siemens · SINEC NMSversion=0 <V3.0 SP1
Siemens · SIMATIC S7-1500 TM MFP - GNU/Linux subsystemversion=0 <*
OpenSSL Project · OpenSSLversion=3.0.0 <3.0.13; version=3.1.0 <3.1.5; version=3.2.0 <3.2.1

Published CVSS scores

6.5Siemens ProductCERTCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-787Out-of-bounds Write
T1499.004Application or System Exploitation

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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