CVE-2022-4304

What it is

A timing based side channel exists in the OpenSSL RSA Decryption implementation which could be sufficient to recover a plaintext across a network in a Bleichenbacher style attack. To achieve a successful decryption an attacker would have to be able to send a very large number of trial messages for decryption. The vulnerability affects all RSA padding modes: PKCS#1 v1.5, RSA-OEAP and RSASVE. For example, in a TLS connection, RSA is commonly used by a client to send an encrypted pre-master secret to the server. An attacker that had observed a genuine connection between a client and a server could use this flaw to send trial messages to the server and record the time taken to process them. After a sufficiently large number of messages the attacker could recover the pre-master secret used for the original connection and thus be able to decrypt the application data sent over that connection.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of data exposure.

Exploit odds

23.5% chance of exploitation in the next 30 days (EPSS). Higher than most.

Fix

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

Timeline

1. 2023-02-08 20:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-10-14 15:16 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 23.5% in the next 30 days (EPSS).
• Severity: 5.9 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2023-02-08 20:15 UTC

Last modified

2026-10-14 15:16 UTC

Exploit probability

23.5% · EPSS, next 30 days

Weakness

CWE-203

Record status

Modified

Affected

• OpenSSL < 1.0.2zg
• OpenSSL < 1.1.1t
• OpenSSL < 3.0.8
• Stormshield Endpoint Security < 7.2.40
• Stormshield Sslvpn < 3.2.1
• Stormshield Network Security < 2.7.11
• Stormshield Network Security < 3.7.34
• Stormshield Network Security < 3.11.22

Attack profile CVSS 3.1 · 5.9

Attack vector

Network

Complexity

High

Privileges needed

None

User interaction

None

Scope

Unchanged

Confidentiality

High

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-2022-4304.md and follow it. Check whether this project is affected by CVE-2022-4304. 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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