CVE-2023-4807

Application state corruption via unsaved XMM registers

Published Sep 8, 2023 · Updated Aug 27, 2025

Memory corruption in OpenSSL POLY1305 on Windows 64 versions 1.1.1 through 3.1.2 allows attackers to corrupt application state via crafted MAC use. The POLY1305 implementation zeroes non-volatile XMM registers instead of restoring them when processing more than 64 bytes on AVX512-IFMA processors. A remote client can influence cipher selection in TLS applications, but OpenSSL reports no concrete affected application; likely outcomes are incorrect calculations or a crash causing denial of service.

CVSS severity7.8
High
EPSS probability0.84%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Memory corruption in OpenSSL POLY1305 on Windows 64 versions 1.1.1 through 3.1.2 allows attackers to corrupt application state via crafted MAC use. The POLY1305 implementation zeroes non-volatile XMM registers instead of restoring them when processing more than 64 bytes on AVX512-IFMA processors. A remote client can influence cipher selection in TLS applications, but OpenSSL reports no concrete affected application; likely outcomes are incorrect calculations or a crash causing denial of service.

The record

CVE
CVE-2023-4807
Published
Sep 8, 2023
Updated
Aug 27, 2025
Vendor
OpenSSL Project
Product
OpenSSL
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 8, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 27, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=1.1.1 <1.1.1w
  2. Affected versionversion=3.0.0 <3.0.11
  3. Affected versionversion=3.1.0 <3.1.3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

OpenSSL Project · OpenSSLversion=1.1.1 <1.1.1w; version=3.0.0 <3.0.11; version=3.1.0 <3.1.3

Published CVSS scores

7.8NVDCVSS:3.1/AV:L/AC:L/PR:L/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.

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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo