CVE-2022-45195: SimpleXMQ before 3.4.0, as used in SimpleX Chat before 4.2, does not apply a key derivation function to intend

Q: How do I fix CVE-2022-45195?

simplex chat: upgrade to 4.2; simplexmq: upgrade to 3.4.0. Exact commands for each OS are on this page.

Q: Is CVE-2022-45195 being exploited?

CVE-2022-45195 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2022-45195 affect?

CVE-2022-45195 affects simplex chat, simplexmq. Severity is medium (CVSS 5.3). SimpleXMQ before 3.4.0, as used in SimpleX Chat before 4.2, does not apply a key derivation function to intended data, which can interfere with forward secrecy and can have other impacts if there is a compromise of a single private key. Thi

Q: How urgent is CVE-2022-45195?

Priority 36/100. Public exploit reference

Routine

MEDIUM 5.3UPGRADEUPGRADE

CVE-2022-45195 is a medium-severity flaw (CVSS 5.3) affecting simplex chat, simplexmq. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

SimpleXMQ before 3.4.0, as used in SimpleX Chat before 4.2, does not apply a key derivation function to intended data, which can interfere with forward secrecy and can have other impacts if there is a compromise of a single private key. This occurs in the X3DH key exchange for the double ratchet protocol.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.6% (top 49%)
CISA exploited list	No
Weakness	CWE-327
Published	2022-11-12
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: simplex

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

Am I affected?

Timeline

2022-11-12 19:15 UTCPublished CVE record published
2026-06-17 05:09 UTCUpdated Record last modified

simplex simplex chat UPGRADE

Affected: < 4.2

Fixed in: 4.2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy simplex-chat || rpm -q simplex-chat || simplex-chat --version

2. UPGRADE to 4.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade simplex-chat

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade simplex-chat

Note

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

simplex simplexmq UPGRADE

Affected: < 3.4.0

Fixed in: 3.4.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy simplexmq || rpm -q simplexmq || simplexmq --version

2. UPGRADE to 3.4.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade simplexmq

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade simplexmq

Note

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

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-2022-45195?

simplex chat: upgrade to 4.2; simplexmq: upgrade to 3.4.0. Exact commands for each OS are on this page.

Is CVE-2022-45195 being exploited?

CVE-2022-45195 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-2022-45195 affect?

CVE-2022-45195 affects simplex chat, simplexmq. Severity is medium (CVSS 5.3). SimpleXMQ before 3.4.0, as used in SimpleX Chat before 4.2, does not apply a key derivation function to intended data, which can interfere with forward secrecy and can have other impacts if there is a compromise of a single private key. Thi

How urgent is CVE-2022-45195?

Priority 36/100. Public exploit reference

References

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