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Fencer Vulns
critical 9.1

CVE-2021-3850 json

Authentication Bypass by Primary Weakness in adodb/adodb

published 2022-01-25 4 y ago modified 2026-06-17 4 mo ago also GHSA-65mj-7c86-79jf , EUVD-2022-0478

cvss
9.1
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
2.2%
EPSS 2.2% chance of exploitation in 30 days, percentile 82%
public exploits
0
none known

Summary

Authentication Bypass by Primary Weakness in GitHub repository adodb/adodb prior to 5.20.21.

Patch / fix

  • packagist adodb/adodb-php 5.20.21, 5.21.4
  • adodb adodb/adodb 5.20.21
  • libphp-adodb Debian 14, Debian 13, Debian 12 5.21.4-1

debian advisories DEBIAN-CVE-2021-3850

  • libphp-adodb Ubuntu 22.04 LTS 5.20.19-1ubuntu0.1
  • libphp-adodb Ubuntu Pro 16.04 LTS 5.20.3-1ubuntu1+esm1
  • libphp-adodb Ubuntu Pro 18.04 LTS 5.20.9-1ubuntu0.1~esm1
  • libphp-adodb Ubuntu Pro 20.04 LTS 5.20.16-1ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2021-3850

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-3850 updated cvss 9.1

php-adodb: authentication bypass in PostgreSQL connections

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.17% chance of exploitation in the next 30 days, higher than 82% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • huntr.dev https://huntr.dev/bounties/bdf5f216-4499-4225-a737-b28bc6f5801c referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.0 9.1 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
NVD 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
NVD 2.0 6.4 AV:N/AC:L/Au:N/C:P/I:P/A:N
GitHub 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected packages

ecosystem package affected fixed in
packagist adodb/adodb-php
<5.20.21
>=5.21.0, <5.21.4
5.20.21
5.21.4

Affected products

  • adodb adodb/adodb

Classification

Weakness
  • CWE-305 Authentication Bypass by Primary Weakness
  • CWE-287 Improper Authentication

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.