CVE-2023-33855: Under certain conditions, RSA operations performed by IBM Common Cryptographic Architecture (CCA) 7.0.0 throug

Routine

LOW 3.7REMOTEUPGRADE

CVE-2023-33855 is a low-severity flaw (CVSS 3.7) affecting common cryptographic architecture. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Under certain conditions, RSA operations performed by IBM Common Cryptographic Architecture (CCA) 7.0.0 through 7.5.36 may exhibit non-constant-time behavior. This could allow a remote attacker to obtain sensitive information using a timing-based attack. IBM X-Force ID: 257676.

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	3.7 (Low)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 61%)
CISA exploited list	No
Weakness	CWE-385
Published	2024-03-26
Last modified	2026-06-17

Publisher (CNA): IBM Corporation · Vendor: ibm

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-03-26 14:15 UTCPublished CVE record published
2026-06-17 06:02 UTCUpdated Record last modified

ibm common cryptographic architecture UPGRADE

Affected: >= 7.0.0 and < 7.5.37

Fixed in: 7.5.37

Safe to downgrade to: a release before 7.0.0

1. Check installed version

apt-cache policy common-cryptographic-architecture || rpm -q common-cryptographic-architecture || common-cryptographic-architecture --version

2. UPGRADE to 7.5.37 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade common-cryptographic-architecture

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade common-cryptographic-architecture

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 7.0.0 (Debian / Ubuntu)

apt-cache madison common-cryptographic-architecture sudo apt install common-cryptographic-architecture=<VERSION_BEFORE_7.0.0> sudo apt-mark hold common-cryptographic-architecture

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list common-cryptographic-architecture sudo dnf downgrade common-cryptographic-architecture-<VERSION_BEFORE_7.0.0> sudo dnf versionlock add common-cryptographic-architecture

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-33855?

common cryptographic architecture: upgrade to 7.5.37. Exact commands for each OS are on this page.

Is CVE-2023-33855 being exploited?

CVE-2023-33855 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-33855 affect?

CVE-2023-33855 affects common cryptographic architecture. Severity is low (CVSS 3.7). Under certain conditions, RSA operations performed by IBM Common Cryptographic Architecture (CCA) 7.0.0 through 7.5.36 may exhibit non-constant-time behavior. This could allow a remote attacker to obtain sensitive information using a timin

How urgent is CVE-2023-33855?

Priority 28/100. Remotely exploitable, no login, no user action

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References

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