CVE-2023-3247

What it is

In PHP versions 8.0.* before 8.0.29, 8.1.* before 8.1.20, 8.2.* before 8.2.7 when using SOAP HTTP Digest Authentication, random value generator was not checked for failure, and was using narrower range of values than it should have. In case of random generator failure, it could lead to a disclosure of 31 bits of uninitialized memory from the client to the server, and it also made easier to a malicious server to guess the client's nonce. 

At a glance

Exploitability

Can be exploited over the network with a low-privilege account, but needs a user to act. Limited direct impact.

Exploit odds

0.7% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2023-07-22 05:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 06:13 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 0.7% in the next 30 days (EPSS).
• Severity: 2.6 LOW (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2023-07-22 05:15 UTC

Last modified

2026-06-17 06:13 UTC

Exploit probability

0.7% · EPSS, next 30 days

Weakness

CWE-252

Record status

Modified

Affected

• PHP < 8.0.29
• PHP < 8.1.20
• PHP < 8.2.7

Attack profile CVSS 3.1 · 2.6

Attack vector

Network

Complexity

High

Privileges needed

Low

User interaction

Required

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

None

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2023-3247.md and follow it. Check whether this project is affected by CVE-2023-3247. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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