CVE-2021-43174

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.7%, top 27% 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
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 7.5Exploit: NoneExposed: 0

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

NLnet Labs Routinator versions 0.9.0 up to and including 0.10.1, support the gzip transfer encoding when querying RRDP repositories. This encoding can be used by an RRDP repository to cause an out-of-memory crash in these versions of Routinator. RRDP uses XML which allows arbitrary amounts of white space in the encoded data. The gzip scheme compresses such white space extremely well, leading to very small compressed files that become huge when being decompressed for further processing, big enough that Routinator runs out of memory when parsing input data waiting for the next XML element.

CVSS v3
7.5
EG Score
7.5(medium)
EPSS
63.8%
KEV
Not listed

Published

November 9, 2021

Last Modified

November 21, 2024

References (4)

Affected Packages

(1 across 1 ecosystem)
crates.io(1)
PackageVulnerable rangeFixed inDependents
routinator—0.10.2—

Weakness Classification(2)

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

Data Freshness Timeline

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2021-43174?
CVE-2021-43174 is a high vulnerability published on November 9, 2021. NLnet Labs Routinator versions 0.9.0 up to and including 0.10.1, support the gzip transfer encoding when querying RRDP repositories. This encoding can be used by an RRDP repository to cause an out-of-memory crash in these versions of Routinator. RRDP uses XML which allows arbitrary amounts of white…
When was CVE-2021-43174 disclosed?
CVE-2021-43174 was first published in the National Vulnerability Database on November 9, 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-2021-43174 actively exploited?
CVE-2021-43174 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 63.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-43174?
CVE-2021-43174 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2021-43174?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-43174, 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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