CVE-2021-43766: Odyssey passes to server unencrypted bytes from man-in-the-middle When Odyssey is configured to use certificat

This month

HIGH 8.1REMOTEDOWNGRADE

CVE-2021-43766 is a high-severity flaw (CVSS 8.1) affecting odyssey. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Odyssey passes to server unencrypted bytes from man-in-the-middle When Odyssey is configured to use certificate Common Name for client authentication, a man-in-the-middle attacker can inject arbitrary SQL queries when a connection is first established, despite the use of SSL certificate verification and encryption. This is similar to CVE-2021-23214 for PostgreSQL.

Why this priority

High severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 54%)
CISA exploited list	No
Weakness	CWE-89, CWE-295
Published	2022-08-25
Last modified	2026-06-17

Publisher (CNA): Fedora Project · Vendor: odyssey project

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

Am I affected?

Timeline

2022-08-25 18:15 UTCPublished CVE record published
2026-06-17 04:11 UTCUpdated Record last modified

odyssey project odyssey DOWNGRADE

Affected: 1.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.1

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.1 (Debian / Ubuntu)

apt-cache madison odyssey sudo apt install odyssey=<VERSION_BEFORE_1.1> sudo apt-mark hold odyssey

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list odyssey sudo dnf downgrade odyssey-<VERSION_BEFORE_1.1> sudo dnf versionlock add odyssey

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-2021-43766?

odyssey: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-43766 being exploited?

CVE-2021-43766 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-2021-43766 affect?

CVE-2021-43766 affects odyssey. Severity is high (CVSS 8.1). Odyssey passes to server unencrypted bytes from man-in-the-middle When Odyssey is configured to use certificate Common Name for client authentication, a man-in-the-middle attacker can inject arbitrary SQL queries when a connection is first

How urgent is CVE-2021-43766?

Priority 45/100. High severity; Remotely exploitable, no login, no user action

Software pages

PostgreSQL vulnerabilities

References

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