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CVE-2021-3850

30
FAUCET Score

CVE-2021-3850 is a critical authentication bypass vulnerability (CWE-287, CWE-305) affecting adodb/adodb prior to version 5.20.21, as well as several Debian packages. With a CVSS score of 9.1, this vulnerability allows unauthenticated attackers to remotely bypass authentication with low attack complexity, leading to high impact on confidentiality and integrity. While there is no evidence of active exploitation (KEV inactive) and no public exploit code (Metasploit, Nuclei, ExploitDB), the vulnerability has garnered significant community discussion with 10 mentions, indicating awareness among security researchers.

Impacted Technologies

VendorProductVersion(s)CPE
<= 5.20.21CPE matchmatch criteria
cpe:2.3:a:adodb_project:adodb:*:*:*:*:*:*:*:*
9.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

9.1CRITICAL

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
5.2
CvssVersion
3.0

Exploit Intelligence

EPSS Score
2.17%
Probability of exploitation in next 30 days
EPSS Percentile
80.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0217 is in the 70th percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

composerpatch availablevia ghsa
Product: adodb/adodb-phpFixed in: 5.20.21
composerpatch availablevia ghsa
Product: adodb/adodb-phpFixed in: 5.21.4
github_advisorypatch availablevia nvd_reference
View patch

Vendor Advisories (1)

composerGHSA-65mj-7c86-79jfcritical

Authentication Bypass in ADOdb/ADOdb

Jan 27, 2022

References

github.com / adodb/adodb/commit/952de6c4273d9b1e91c2b838044f8c2111150c29
PatchThird Party Advisory
huntr.dev / bounties/bdf5f216-4499-4225-a737-b28bc6f5801c
ExploitIssue TrackingPatchThird Party Advisory
lists.debian.org / debian-lts-announce/2022/02/msg00006.html
Mailing ListThird Party Advisory
debian.org / security/2022/dsa-5101
Third Party Advisory