Vulnerability · CVE-2022-4304
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.
Published Feb 8, 2023 · catalog updated Oct 14, 2026 · A timing based side
Check this week
CVE-2022-4304 is not in CISA KEV. FIRST estimates a 23.51% chance of exploitation in the next 30 days. Check whether you run A timing based side.
Gaps on this record
- The stored product name is a package slug. The name on this page is taken from the title (A timing based side).
- No version range is stored. A customer cannot check an installed version against this record.
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
- Severity
- Medium5.9
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 23.51%
- Remediation
- Advisory link
- Affected products
- cpe openssl/openssl · cpe stormshield/endpoint security · cpe stormshield/sslvpn · cpe stormshield/stormshield network security
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.
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- cpe openssl/opensslversion unspecified
- cpe stormshield/endpoint securityversion unspecified
- cpe stormshield/sslvpnversion unspecified
- cpe stormshield/stormshield network securityversion unspecified
How to fix CVE-2022-4304
Recommended remediation
A patch or advisory reference is linked. Open the original publisher for availability by product version.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
CVE-2022-4304 is not in CISA KEV. FIRST estimates a 23.51% chance of exploitation in the next 30 days. Check whether you run A timing based side.
Which versions are affected?
Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
CWE-203: Observable Discrepancy. EPSS 23.51%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Feb 8, 2023 · NIST NVD
Detected
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 ex
Oct 14, 2026 · NIST NVD
Updated
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 ex
Sources
- CVE.orgVulnerability recordCVE-2022-4304
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2022-4304
30-day exploitation probability 23.5%
first.org - NIST NVDVulnerability recordCVE-2022-4304
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
nvd.nist.gov
References
Freshness
Last verified in this catalog Oct 16, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.