CVE-2021-30641

MEDIUMNVD 5.36.8▲
EchelonGraph scoreHIGH confidence

Score elevated to 6.8 because EPSS predicts 52% probability of exploitation within the next 30 days (top 1.1% of all CVEs). NVD baseline CVSS 5.3 retained for reference. Confidence: see factors.

Triggered by: EPSS exploit prediction ≥85%
Sources: epss, nvd
Elevated
5.3
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • 132 internet-exposed hosts are running an affected version right now
  • High exploitation likelihood — EPSS 52%
CISA-KEV: Not listedEPSS: 52%CVSS: 5.3Exploit: NoneExposed: 132

A fix is available — apply it.

Apache HTTP Server versions 2.4.39 to 2.4.46 Unexpected matching behavior with 'MergeSlashes OFF'

Live · internet exposure

132 internet-exposed hosts are running an affected version of CVE-2021-30641 right now.

across 29 countries (United States, Germany, Singapore, France, China)top: http_server
See the live KEV-Exposure radar →Found passively from public internet-scan data — aggregate, host-redacted.

EchelonGraph is the only CVE feed that fuses live vulnerability intelligence with its own live internet-exposure radar — so you see not just that a CVE is exploited, but how much of the internet is exposed to it right now.

CVSS v3
5.3
EG Score
6.8(high)
EG Risk
56(Track)
EG Risk 56/100SSVC: 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
Severity68% × 45%
Exploitation52% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
98.9%
KEV
Not listed

Published

June 10, 2021

Last Modified

November 21, 2024

References (24)

Vendor Advisories for CVE-2021-30641(2)

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

Patch Availability(5)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuapache2-bin (2.4.46-4ubuntu1.1) @ hirsute2026-05-23ubuntu
ubuntuapache2-utils (2.4.18-2ubuntu3.17+esm1) @ xenial2026-05-23ubuntu
redhatjbcs-httpd24-openssl-pkcs11-0:0.4.10-22.jbcs.el72021-11-10redhat
redhathttpd2021-11-10redhat
redhathttpd:2.4-8050020210712211742.b4937e532021-11-09redhat

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.

Additional Vendor Advisories

(4)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 10× in last 7d / 39× 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.

  1. 2026-07-23 02:00 UTCEG score recompute▲ 1.50
  2. 2026-07-22 22:47 UTCEG score recompute
  3. 2026-07-22 14:06 UTCEPSS rescore
  4. 2026-07-22 14:06 UTCEPSS rescore
  5. 2026-07-21 15:22 UTCEPSS rescore
  6. 2026-07-21 15:22 UTCEPSS rescore
  7. 2026-07-20 17:05 UTCEPSS rescore
  8. 2026-07-19 02:27 UTCEPSS rescore
  9. 2026-07-19 02:27 UTCEPSS rescore
  10. 2026-07-16 17:00 UTCEPSS rescore
  11. 2026-07-15 16:55 UTCEPSS rescore
  12. 2026-07-15 16:55 UTCEPSS rescore
  13. 2026-07-13 22:27 UTCEPSS rescore
  14. 2026-07-13 22:27 UTCEPSS rescore
  15. 2026-07-13 06:10 UTCEPSS rescore
  16. 2026-07-13 03:37 UTCOSV refresh
  17. 2026-07-12 05:44 UTCEPSS rescore
  18. 2026-07-12 05:44 UTCEPSS rescore
  19. 2026-07-11 08:25 UTCEPSS rescore
  20. 2026-07-11 08:25 UTCEPSS rescore
  21. 2026-07-09 19:07 UTCEPSS rescore
  22. 2026-07-08 15:12 UTCEPSS rescore
  23. 2026-07-06 02:21 UTCEPSS rescore
  24. 2026-07-06 02:21 UTCEPSS rescore
  25. 2026-07-04 06:29 UTCEPSS rescore
Show 57 more
  1. 2026-07-04 06:29 UTCEPSS rescore
  2. 2026-07-02 16:57 UTCEPSS rescore
  3. 2026-07-01 15:03 UTCEPSS rescore
  4. 2026-06-30 23:20 UTCEPSS rescore
  5. 2026-06-30 23:20 UTCEPSS rescore
  6. 2026-06-28 04:54 UTCEPSS rescore
  7. 2026-06-28 04:54 UTCEPSS rescore
  8. 2026-06-27 03:06 UTCEPSS rescore
  9. 2026-06-27 03:06 UTCEPSS rescore
  10. 2026-06-25 13:48 UTCEPSS rescore
  11. 2026-06-25 13:48 UTCEPSS rescore
  12. 2026-06-24 13:02 UTCOSV refresh
  13. 2026-06-23 21:31 UTCEPSS rescore
  14. 2026-06-23 21:31 UTCEPSS rescore
  15. 2026-06-22 14:24 UTCEPSS rescore
  16. 2026-06-22 14:24 UTCEPSS rescore
  17. 2026-06-21 14:55 UTCEPSS rescore
  18. 2026-06-21 14:54 UTCEPSS rescore
  19. 2026-06-21 01:58 UTCEPSS rescore
  20. 2026-06-21 01:58 UTCEPSS rescore
  21. 2026-06-18 17:51 UTCEPSS rescore
  22. 2026-06-18 17:51 UTCEPSS rescore
  23. 2026-06-17 17:51 UTCEPSS rescore
  24. 2026-06-16 17:51 UTCEPSS rescore
  25. 2026-06-15 17:46 UTCEPSS rescore
  26. 2026-06-13 22:58 UTCEPSS rescore
  27. 2026-06-13 22:58 UTCEPSS rescore
  28. 2026-06-12 23:10 UTCEPSS rescore
  29. 2026-06-11 13:58 UTCEPSS rescore
  30. 2026-06-10 22:16 UTCEPSS rescore
  31. 2026-06-10 13:20 UTCEPSS rescore
  32. 2026-06-07 17:46 UTCOSV refresh
  33. 2026-06-07 15:23 UTCEPSS rescore
  34. 2026-06-07 15:23 UTCEPSS rescore
  35. 2026-06-06 13:46 UTCEPSS rescore
  36. 2026-06-06 13:46 UTCEPSS rescore
  37. 2026-06-06 13:46 UTCEPSS rescore
  38. 2026-06-05 22:45 UTCEPSS rescore
  39. 2026-06-05 22:45 UTCEPSS rescore
  40. 2026-06-05 06:09 UTCEPSS rescore
  41. 2026-06-05 06:09 UTCEPSS rescore
  42. 2026-06-02 20:11 UTCEPSS rescore
  43. 2026-06-02 20:11 UTCEPSS rescore
  44. 2026-06-02 20:11 UTCEPSS rescore
  45. 2026-05-31 22:29 UTCEPSS rescore
  46. 2026-05-31 22:29 UTCEPSS rescore
  47. 2026-05-31 00:15 UTCEPSS rescore
  48. 2026-05-29 13:42 UTCEPSS rescore
  49. 2026-05-28 13:43 UTCEPSS rescore
  50. 2026-05-28 13:43 UTCEPSS rescore
  51. 2026-05-27 13:39 UTCEPSS rescore
  52. 2026-05-27 13:39 UTCEPSS rescore
  53. 2026-05-26 07:17 UTCEPSS rescore
  54. 2026-05-26 07:17 UTCEPSS rescore
  55. 2026-05-23 08:13 UTCEG score recompute
  56. 2026-05-23 08:13 UTCVendor advisory
  57. 2026-05-23 08:13 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2021-30641?
CVE-2021-30641 is a medium vulnerability published on June 10, 2021. Apache HTTP Server versions 2.4.39 to 2.4.46 Unexpected matching behavior with 'MergeSlashes OFF'
When was CVE-2021-30641 disclosed?
CVE-2021-30641 was first published in the National Vulnerability Database on June 10, 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-2021-30641 actively exploited?
CVE-2021-30641 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 98.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-30641?
CVE-2021-30641 has a CVSS v3 base score of 5.3 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 6.8.
How do I remediate CVE-2021-30641?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-30641, 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

Explore the affected products and dependency analysis for CVE-2021-30641

Explore →

Is Your Infrastructure Affected by CVE-2021-30641?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs