CVE-2020-5300

MEDIUMNVD 5.85.8—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.8 under NVD CVSS v3. EPSS exploit probability: 1.0%, top 40% of all CVEs by exploit prediction. 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
5.8EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 5.8Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

In Hydra (an OAuth2 Server and OpenID Certified™ OpenID Connect Provider written in Go), before version 1.4.0+oryOS.17, when using client authentication method 'private_key_jwt' [1], OpenId specification says the following about assertion jti: "A unique identifier for the token, which can be used to prevent reuse of the token. These tokens MUST only be used once, unless conditions for reuse were negotiated between the parties". Hydra does not check the uniqueness of this jti value. Exploiting this vulnerability is somewhat difficult because: - TLS protects against MITM which makes it difficult to intercept valid tokens for replay attacks - The expiry time of the JWT gives only a short window of opportunity where it could be replayed This has been patched in version v1.4.0+oryOS.17

CVSS v3
5.8
EG Score
5.8(medium)
EG Risk
31(Track)
EG Risk 31/100SSVC: Track

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
Severity58% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
60%
KEV
Not listed

Published

April 6, 2020

Last Modified

November 21, 2024

References (6)

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFixed inDependents
github.com/ory/hydra—1.4.0—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 45× 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 105 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2020-5300?
CVE-2020-5300 is a medium vulnerability published on April 6, 2020. In Hydra (an OAuth2 Server and OpenID Certified™ OpenID Connect Provider written in Go), before version 1.4.0+oryOS.17, when using client authentication method 'privatekeyjwt' [1], OpenId specification says the following about assertion jti: "A unique identifier for the token, which can be used to…
When was CVE-2020-5300 disclosed?
CVE-2020-5300 was first published in the National Vulnerability Database on April 6, 2020, 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-2020-5300 actively exploited?
CVE-2020-5300 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 39.9% of all scored CVEs.
What is the CVSS score of CVE-2020-5300?
CVE-2020-5300 has a CVSS v3 base score of 5.8 (NVD).
How do I remediate CVE-2020-5300?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-5300, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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