CVE-2021-35473

CRITICALNVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2024-11-11. NVD baseline CVSS 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, 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: 0.4%CVSS: 9.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

An issue was discovered in LemonLDAP::NG before 2.0.12. There is a missing expiration check in the OAuth2.0 handler, i.e., it does not verify access token validity. An attacker can use a expired access token from an OIDC client to access the OAuth2 handler The earliest affected version is 2.0.4.

CVSS v3
9.1
EG Score
9.1CRITICALmedium confidence
EG Risk
56
EG Risk 56/100CISA 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%
Exploitation0% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; 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
0.4%
EPSS %ILE
33rd
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; 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 (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). 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

November 10, 2024

Last Modified

April 15, 2026

Advisory Details (2)

Auto-updated Aug 1, 2026
Patch available.
generic

Tags · LemonLDAP NG / lemonldap-ng · GitLab

https://gitlab.ow2.org/lemonldap-ng/lemonldap-ng/-/tags
generic

[security:low, CVE-2021-35473] OAuth2 handler does not verify access token validity (#2549) · Issues · LemonLDAP NG / lemonldap-ng · GitLab

https://gitlab.ow2.org/lemonldap-ng/lemonldap-ng/-/issues/2549

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
lemonldap-ng—
  • every version up to 2.0.11+ds-4: fixed in 2.0.11+ds-4
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
lemonldap-ng—
  • every version up to 2.0.11+ds-4: fixed in 2.0.11+ds-4
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
lemonldap-ng—
  • every version up to 2.0.11+ds-4: fixed in 2.0.11+ds-4
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
lemonldap-ng—
  • every version up to 2.0.11+ds-4: fixed in 2.0.11+ds-4
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 35× 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 228 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2021-35473?
CVE-2021-35473 is a critical vulnerability published on November 10, 2024. An issue was discovered in LemonLDAP::NG before 2.0.12. There is a missing expiration check in the OAuth2.0 handler, i.e., it does not verify access token validity. An attacker can use a expired access token from an OIDC client to access the OAuth2 handler The earliest affected version is 2.0.4.
When was CVE-2021-35473 disclosed?
CVE-2021-35473 was first published on November 10, 2024, with the most recent update on April 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-35473 actively exploited?
CVE-2021-35473 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (33rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2021-35473?
CVE-2021-35473 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2021-35473?
A fix for CVE-2021-35473 is available: update to the fixed version the vendor names in its advisory.

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