CVE-2021-23926

CRITICALNVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.1 under NVD CVSS v3. EPSS exploit probability: 6.2% (93rd 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: 6.3%CVSS: 9.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

The XML parsers used by XMLBeans up to version 2.6.0 did not set the properties needed to protect the user from malicious XML input. Vulnerabilities include possibilities for XML Entity Expansion attacks. Affects XMLBeans up to and including v2.6.0.

CVSS v3
9.1
EG Score
9.1CRITICALmedium confidence
EG Risk
48
EG Risk 48/100CISA 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%
Exploitation6% × 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
6.3%
EPSS %ILE
93rd
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 14, 2021

Last Modified

November 21, 2024

Advisory Details (6)

Auto-updated Jul 19, 2026
Patch available.
generic
https://lists.apache.org/thread.html/r2dc5588009dc9f0310b7382269f932cc96cae4c3901b747dda1a7fed%40%3Cjava-dev.axis.apache.org%3E
generic

[XMLBEANS-517] Use safe XML parsers - ASF Jira

https://issues.apache.org/jira/browse/XMLBEANS-517
generic

NetApp Product Security

https://security.netapp.com/advisory/ntap-20210513-0004/
generic

Apache POI™ - the Java API for Microsoft Documents

https://poi.apache.org/
genericMentions a patch (unverified)

[SECURITY] [DLA 2693-1] xmlbeans security update

https://lists.debian.org/debian-lts-announce/2021/06/msg00024.html
generic
https://lists.apache.org/thread.html/rbb01d10512098894cd5f22325588197532c64f1c818ea7e4120d40c1%40%3Cjava-dev.axis.apache.org%3E

Vendor Advisories for CVE-2021-23926(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatxmlbeans2021-12-14redhat

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

(6 across 6 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
xmlbeans—
  • every version up to 3.0.2-1: fixed in 3.0.2-1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
xmlbeans—
  • every version up to 3.0.2-1: fixed in 3.0.2-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
xmlbeans—
  • every version up to 3.0.2-1: fixed in 3.0.2-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
xmlbeans—
  • every version up to 3.0.2-1: fixed in 3.0.2-1
—
Debian:9(1)
PackageVulnerable rangeFix by version rangeDependents
xmlbeans2.6.0+dfsg-1
  • every version up to 2.6.0+dfsg-1+deb9u1: fixed in 2.6.0+dfsg-1+deb9u1
—
Maven(1)
PackageVulnerable rangeFix by version rangeDependents
org.apache.xmlbeans:xmlbeans2.2.0, 2.3.0, 2.4.0, 2.5.0, 2.6.0
  • every version up to 3.0.0: fixed in 3.0.0
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 31× 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 178 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2021-23926?
CVE-2021-23926 is a critical vulnerability published on January 14, 2021. The XML parsers used by XMLBeans up to version 2.6.0 did not set the properties needed to protect the user from malicious XML input. Vulnerabilities include possibilities for XML Entity Expansion attacks. Affects XMLBeans up to and including v2.6.0.
When was CVE-2021-23926 disclosed?
CVE-2021-23926 was first published on January 14, 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-2021-23926 actively exploited?
CVE-2021-23926 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 6.3% probability of exploitation in the next 30 days (93rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2021-23926?
CVE-2021-23926 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2021-23926?
A fix for CVE-2021-23926 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2021-23926 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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