CVE-2023-4540

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

1.09% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 65.2% of scored records. A rank, not a probability.

NVD base score

7.5 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2023-09-05 07:46Z3 YR AGO

Last updated

2025-04-04 18:33Z1 YR AGO

Reserved

2023-08-25

Assigning CNA

CERT-PL

Record state

PUBLISHED

Severity

High (CVSS 7.5)

CNA CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weaknesses

• CWE-755Improper Handling of Exceptional ConditionsClass

Data version

5.1

Document digest

1a1e60a3f44c2d1ed165016e13943bc38458e126564390d5b2edf7e8a0fd229d

• github.comhttps://github.com/daurnimator/lua-http/commit/ddab2835c583d45dec62680ca8d3cbde55e0bae6patch
• cert.plhttps://cert.pl/posts/2023/09/CVE-2023-4540/third-party-advisory
• cert.plhttps://cert.pl/en/posts/2023/09/CVE-2023-4540/third-party-advisory
• httpshttps://https://cert.pl/en/posts/2023/09/CVE-2023-4540/third-party-advisory