CVE-2021-3850

CRITICALNVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.1 under NVD CVSS v3. EPSS exploit probability: 2.2% (81st percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2.2%CVSS: 9.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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

CVSS v3
9.1
EG Score
9.1CRITICALmedium confidence
EG Risk
46
EG Risk 46/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity91% × 45%
Exploitation2% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track* or Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
2.2%
EPSS %ILE
81st
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* or Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact total (CVSS ≥ 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

January 25, 2022

Last Modified

November 21, 2024

Advisory Details (4)

Auto-updated Jul 20, 2026
Patch available. Sources: github_commit.
generic

[SECURITY] [DSA 5101-1] libphp-adodb security update

https://www.debian.org/security/2022/dsa-5101
genericMentions a patch (unverified)

[SECURITY] [DLA 2912-1] libphp-adodb security update

https://lists.debian.org/debian-lts-announce/2022/02/msg00006.html
generic

huntr - The world's first bug bounty platform for AI/ML

https://huntr.dev/bounties/bdf5f216-4499-4225-a737-b28bc6f5801c
github_commit Patch Available

commit 952de6c4273d (adodb/adodb)

Patch available: adodb/adodb v5.20.21 (contains commit 952de6c4273d)

https://github.com/adodb/adodb/commit/952de6c4273d9b1e91c2b838044f8c2111150c29

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulibphp-adodb (5.20.3-1ubuntu1+esm1) @ xenial2026-05-26ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(7 across 7 ecosystems)
Debian:10(1)
PackageVulnerable rangeFix by version rangeDependents
libphp-adodb5.20.14-1
  • every version up to 5.20.14-1+deb10u1: fixed in 5.20.14-1+deb10u1
—
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
libphp-adodb5.20.19-1
  • every version up to 5.20.19-1+deb11u1: fixed in 5.20.19-1+deb11u1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
libphp-adodb—
  • every version up to 5.21.4-1: fixed in 5.21.4-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
libphp-adodb—
  • every version up to 5.21.4-1: fixed in 5.21.4-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
libphp-adodb—
  • every version up to 5.21.4-1: fixed in 5.21.4-1
—
Debian:9(1)
PackageVulnerable rangeFix by version rangeDependents
libphp-adodb5.20.9-1
  • every version up to 5.20.9-1+deb9u1: fixed in 5.20.9-1+deb9u1
—
Packagist(1)
PackageVulnerable rangeFix by version rangeDependents
adodb/adodb-phpv5.21.0, v5.21.1, v5.21.2, v5.21.3
  • every version up to 5.20.21: fixed in 5.20.21
  • 5.21.0 up to 5.21.4: fixed in 5.21.4
—

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 6× in last 7d / 32× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 185 total refreshes for this CVE.

  1. 2026-10-09 20:04 UTCEPSS rescore
  2. 2026-10-08 16:40 UTCEPSS rescore
  3. 2026-10-07 23:45 UTCEPSS rescore
  4. 2026-10-06 15:14 UTCEPSS rescore
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  7. 2026-10-03 14:22 UTCEPSS rescore
  8. 2026-10-02 16:23 UTCEPSS rescore
  9. 2026-10-01 19:46 UTCEPSS rescore
  10. 2026-09-30 15:39 UTCEG score recompute
  11. 2026-09-30 15:00 UTCEPSS rescore
  12. 2026-09-29 15:15 UTCEPSS rescore
  13. 2026-09-28 13:47 UTCEPSS rescore
  14. 2026-09-27 13:41 UTCEPSS rescore
  15. 2026-09-26 15:54 UTCEPSS rescore
  16. 2026-09-26 00:21 UTCEPSS rescore
  17. 2026-09-25 07:05 UTCOSV refresh
  18. 2026-09-24 14:00 UTCEPSS rescore
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  20. 2026-09-23 13:44 UTCEPSS rescore
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  22. 2026-09-21 20:28 UTCEPSS rescore
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  24. 2026-09-19 15:38 UTCEPSS rescore
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  1. 2026-09-17 19:23 UTCEPSS rescore
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  3. 2026-09-16 14:05 UTCEPSS rescore
  4. 2026-09-15 03:06 UTCEPSS rescore
  5. 2026-09-12 14:57 UTCEPSS rescore
  6. 2026-09-11 14:49 UTCEPSS rescore
  7. 2026-09-11 09:33 UTCEPSS rescore
  8. 2026-09-08 21:56 UTCEPSS rescore
  9. 2026-09-07 15:58 UTCEPSS rescore
  10. 2026-09-06 13:45 UTCEPSS rescore
  11. 2026-09-05 22:30 UTCOSV refresh
  12. 2026-09-05 15:25 UTCEPSS rescore
  13. 2026-09-04 13:57 UTCEPSS rescore
  14. 2026-09-04 05:03 UTCEPSS rescore
  15. 2026-09-02 14:09 UTCEPSS rescore
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  18. 2026-08-30 19:14 UTCEPSS rescore
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  20. 2026-08-30 01:19 UTCEPSS rescore
  21. 2026-08-28 21:37 UTCEPSS rescore
  22. 2026-08-27 14:22 UTCEPSS rescore
  23. 2026-08-26 14:43 UTCEPSS rescore
  24. 2026-08-25 13:46 UTCEPSS rescore
  25. 2026-08-24 14:13 UTCEPSS rescore
  26. 2026-08-23 00:16 UTCEPSS rescore
  27. 2026-08-21 23:46 UTCEPSS rescore
  28. 2026-08-20 22:52 UTCEPSS rescore
  29. 2026-08-20 22:52 UTCEPSS rescore
  30. 2026-08-19 17:01 UTCEPSS rescore
  31. 2026-08-19 09:32 UTCOSV refresh
  32. 2026-08-18 13:45 UTCEPSS rescore
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  34. 2026-08-16 14:53 UTCEPSS rescore
  35. 2026-08-16 02:11 UTCEPSS rescore
  36. 2026-08-15 01:27 UTCEPSS rescore
  37. 2026-08-13 21:57 UTCEPSS rescore
  38. 2026-08-12 13:48 UTCEPSS rescore
  39. 2026-08-11 13:38 UTCEPSS rescore
  40. 2026-08-08 16:33 UTCEPSS rescore
  41. 2026-08-07 16:24 UTCEPSS rescore
  42. 2026-08-06 13:44 UTCEPSS rescore
  43. 2026-08-05 19:14 UTCEPSS rescore
  44. 2026-08-04 10:34 UTCEPSS rescore
  45. 2026-08-04 05:27 UTCOSV refresh
  46. 2026-08-03 10:33 UTCEPSS rescore
  47. 2026-08-02 02:24 UTCEPSS rescore
  48. 2026-08-01 04:13 UTCEPSS rescore
  49. 2026-07-30 16:25 UTCEPSS rescore
  50. 2026-07-30 01:28 UTCEPSS rescore
  51. 2026-07-28 15:33 UTCEPSS rescore
  52. 2026-07-26 14:52 UTCEPSS rescore
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  54. 2026-07-25 14:15 UTCEPSS rescore
  55. 2026-07-24 14:15 UTCEPSS rescore
  56. 2026-07-23 14:16 UTCEPSS rescore
  57. 2026-07-23 02:03 UTCEG score recompute
  58. 2026-07-22 22:50 UTCEG score recompute
  59. 2026-07-22 14:06 UTCEPSS rescore
  60. 2026-07-21 15:22 UTCEPSS rescore
  61. 2026-07-21 15:22 UTCEPSS rescore
  62. 2026-07-20 17:05 UTCEPSS rescore
  63. 2026-07-19 14:29 UTCEPSS rescore
  64. 2026-07-19 02:27 UTCEPSS rescore
  65. 2026-07-18 10:02 UTCEPSS rescore
  66. 2026-07-18 10:02 UTCEPSS rescore
  67. 2026-07-18 02:29 UTCOSV refresh
  68. 2026-07-16 17:00 UTCEPSS rescore
  69. 2026-07-16 17:00 UTCEPSS rescore
  70. 2026-07-15 16:55 UTCEPSS rescore
  71. 2026-07-15 16:55 UTCEPSS rescore
  72. 2026-07-15 01:58 UTCEPSS rescore
  73. 2026-07-13 22:27 UTCEPSS rescore
  74. 2026-07-13 22:27 UTCEPSS rescore
  75. 2026-07-12 05:44 UTCEPSS rescore

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Same vendor

2 shown

ubuntu:USN-6825-1

Frequently asked(5)

What is CVE-2021-3850?
CVE-2021-3850 is a critical vulnerability published on January 25, 2022. Authentication Bypass by Primary Weakness in GitHub repository adodb/adodb prior to 5.20.21.
When was CVE-2021-3850 disclosed?
CVE-2021-3850 was first published on January 25, 2022, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-3850 actively exploited?
CVE-2021-3850 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2.2% probability of exploitation in the next 30 days (81st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2021-3850?
CVE-2021-3850 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2021-3850?
A fix for CVE-2021-3850 is available: update to the fixed version the vendor names in its advisory.

Dependency Blast Radius

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