CVE-2021-23365

MEDIUMNVD 4.84.8—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 4.8 under NVD CVSS v3. EPSS exploit probability: 1.0%, top 41% 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
Trending — 3 sources updated this week
4.8
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 1%CVSS: 4.8Exploit: NoneExposed: 0

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

The package github.com/tyktechnologies/tyk-identity-broker before 1.1.1 are vulnerable to Authentication Bypass via the Go XML parser which can cause SAML authentication bypass. This is because the XML parser doesn’t guarantee integrity in the XML round-trip (encoding/decoding XML data).

CVSS v3
4.8
EG Score
4.8(medium)
EG Risk
27(Track)
EG Risk 27/100SSVC: 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
Severity48% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
59.6%
KEV
Not listed

Published

April 26, 2021

Last Modified

November 21, 2024

References (10)

Affected Packages

(2 across 1 ecosystem)
Go(2)
PackageVulnerable rangeFixed inDependents
github.com/tyktechnologies/tyk-identity-broker—1.1.1—
github.com/TykTechnologies/tyk-identity-broker—1.1.1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 12× in last 7d / 46× 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. 2026-07-25 14:15 UTCEPSS rescore
  2. 2026-07-24 14:15 UTCEPSS rescore
  3. 2026-07-23 14:15 UTCEPSS rescore
  4. 2026-07-23 01:57 UTCEG score recompute
  5. 2026-07-22 22:44 UTCEG score recompute
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  12. 2026-07-18 21:59 UTCOSV refresh
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  1. 2026-07-08 15:12 UTCEPSS rescore
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  42. 2026-06-13 22:58 UTCEPSS rescore
  43. 2026-06-13 07:43 UTCOSV refresh
  44. 2026-06-12 23:10 UTCEPSS rescore
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  46. 2026-06-11 13:58 UTCEPSS rescore
  47. 2026-06-10 22:16 UTCEPSS rescore
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  49. 2026-06-10 13:20 UTCEPSS rescore
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  54. 2026-06-06 13:46 UTCEPSS rescore
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  74. 2026-05-27 13:39 UTCEPSS rescore
  75. 2026-05-26 17:29 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2021-23365?
CVE-2021-23365 is a medium vulnerability published on April 26, 2021. The package github.com/tyktechnologies/tyk-identity-broker before 1.1.1 are vulnerable to Authentication Bypass via the Go XML parser which can cause SAML authentication bypass. This is because the XML parser doesn’t guarantee integrity in the XML round-trip (encoding/decoding XML data).
When was CVE-2021-23365 disclosed?
CVE-2021-23365 was first published in the National Vulnerability Database on April 26, 2021, 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-2021-23365 actively exploited?
CVE-2021-23365 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 59.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-23365?
CVE-2021-23365 has a CVSS v3 base score of 4.8 (NVD).
How do I remediate CVE-2021-23365?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-23365, 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.

Dependency Blast Radius

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