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CVE-2021-43766

26
FAUCET Score

CVE-2021-43766 describes a critical man-in-the-middle vulnerability in Odyssey, a PostgreSQL connection pooler, when configured for client authentication using certificate Common Name. An attacker can inject arbitrary SQL queries during connection establishment, bypassing SSL encryption and verification. This vulnerability carries a CVSS score of 8.1 (High), indicating a network-based attack with high impact on confidentiality, integrity, and availability, despite high attack complexity. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
1.1CPE matchmatch criteria
cpe:2.3:a:odyssey_project:odyssey:1.1:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.1HIGH

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.2
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.46%
Probability of exploitation in next 30 days
EPSS Percentile
37.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0046 is in the 12th percentile among its peer group of 8,918 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

microsoftpatch availablevia msrc
Product: 18630-16820Fixed in: 12.12-1
microsoftpatch availablevia msrc
Product: cm1 postgresql 12.12-1 on CBL Mariner 1.0Fixed in: 12.12-1

Vendor Advisories (1)

microsoft2022-Aug/CVE-2021-43766Important

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.

Aug 9, 2022

References

github.com / yandex/odyssey/issues/376%2C
postgresql.org / support/security/CVE-2021-23214
Not Applicable