No exploitation reportedFix available

CVE-2023-0401

Q: Is CVE-2023-0401 actively exploited?

Active exploitation of CVE-2023-0401 has not been confirmed. Its EPSS score was 1.8% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2023-0401?

CVE-2023-0401 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

No exploitation reported by the sources we read.

Published2023-02-08
WeaknessCWE-476

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

A NULL pointer can be dereferenced when signatures are being verified on PKCS7 signed or signedAndEnveloped data. In case the hash algorithm used for the signature is known to the OpenSSL library but the implementation of the hash algorithm is not available the digest initialization will fail. There is a missing check for the return value from the initialization function which later leads to invalid usage of the digest API most likely leading to a crash. The unavailability of an algorithm can be caused by using FIPS enabled configuration of providers or more commonly by not loading the legacy provider. PKCS7 data is processed by the SMIME library calls and also by the time stamp (TS) library calls. The TLS implementation in OpenSSL does not call these functions however third party applications would be affected if they call these functions to verify signatures on untrusted data.

Timeline

dates in UTC

2023-02-0820:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2023-0401?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2023-0401?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV

OpenSSL

Branch	Affected	Fixed in	Source
3.0	≥ 3.0.0, ≤ 3.0.7	no fix published	NVD

Stormshield stormshield management center

Branch	Affected	Fixed in	Source
3.3	< 3.3.3	3.3.3	NVD

openssl-src

Branch	Affected	Fixed in	Source
300.0	≥ 300.0.0, < 300.0.12	300.0.12	OSV

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

opensslAlmaLinux:9all versions · fixed in 1:3.0.1-47.el9_1and 3 other packages

Vendor advisories

ICSA-25-065-01 CISA3 products fixed · 3 known affected
Hitachi Energy PCU400
PCU400 versions 6.5 K and below · PCU400 versions 9.4.1 and below · PCULogger versions 1.1.0 and below
ICSA-23-320-08 CISA71 known affected
Siemens SCALANCE Family Products
SCALANCE XB205-3 (SC, PN) (6GK5205-3BB00-2AB2) · SCALANCE XB205-3 (ST, E/IP) (6GK5205-3BB00-2TB2) · SCALANCE XB205-3 (ST, E/IP) (6GK5205-3BD00-2TB2) · +68 more
ICSA-23-229-01 CISA1 known affected
ICONICS and Mitsubishi Electric Products
ICONICS Suite including GENESIS64, Hyper Historian, AnalytiX, and MobileHMI: 10.97.2

Full record on NVD

Fix

Vendor fix CISA ICSA-25-065-01 · 1 productIf IEC62351-3 secure for IEC104/DNP3 is used, then update to version 6.6.0 or latest
Vendor fix CISA ICSA-25-065-01 · 1 productIf IEC62351-3 secure for IEC104/DNP3 is used, then update to version 9.4.2 or latest
Vendor fix CISA ICSA-23-320-08 · 71 productsUpdate to V4.5 or later version
Mitigation from the vendor CISA ICSA-23-229-01 · 1 productVersion 10.97.2 Critical Fixes Rollup 2 and later is not vulnerable to these exploits. ICONICS recommends that users of its products take the following mitigation steps:
Mitigation from the vendor CISA ICSA-23-229-01 · 1 productEnsure the 10.97.2 Critical Fixes Rollup release is applied to version 10.97.2 systems.
Mitigation from the vendor CISA ICSA-23-229-01 · 1 productFor systems that do not contain the patch/fix:

Advisories and patches

git.openssl.orgPatch · Vendor Advisory
www.openssl.orgVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

CISA-ADPSSVC decisionnone2025-04-23
OpenCVESSVC decisionnone—
CISA-ADPCVSS 3.17.52025-05-05
NVDCVSS 3.17.5read 2026-10-23
CISA-ADPweakness (CWE)CWE-4762025-05-05
NVDweakness (CWE)CWE-476read 2026-10-23
FIRST EPSSEPSS score1.8 %2026-10-22
OSVaffected packages—

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2023-02-08
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2023-0401?

Is CVE-2023-0401 actively exploited?

Active exploitation of CVE-2023-0401 has not been confirmed. Its EPSS score was 1.8% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2023-0401?

CVE-2023-0401 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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