CVE-2020-37056

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory published 2026-01-31. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: Elevated riskExposed: 0

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

Crystal Shard http-protection 0.2.0 contains an IP spoofing vulnerability that allows attackers to bypass protection middleware by manipulating request headers. Attackers can hardcode consistent IP values across X-Forwarded-For, X-Client-IP, and X-Real-IP headers to circumvent security checks and gain unauthorized access.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
75(Attend)
EG Risk 75/100SSVC: Attend

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
Severity98% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
1%
EPSS %ILE
44%
KEV
Not listed

Published

January 30, 2026

Last Modified

July 28, 2026

Advisory Details (2)

Auto-updated Aug 25, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic

GitHub - rogeriozambon/http-protection: This library protects against typical web attacks. It was inspired in rack-protection Ruby gem. · GitHub

https://github.com/rogeriozambon/http-protection
generic🟡 PoC Available

Crystal Shard http-protection 0.2.0 - IP Spoofing Bypass - Multiple webapps Exploit

https://www.exploit-db.com/exploits/48533

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 4× in last 7d / 44× 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 190 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2020-37056?
CVE-2020-37056 is a critical vulnerability published on January 30, 2026. Crystal Shard http-protection 0.2.0 contains an IP spoofing vulnerability that allows attackers to bypass protection middleware by manipulating request headers. Attackers can hardcode consistent IP values across X-Forwarded-For, X-Client-IP, and X-Real-IP headers to circumvent security checks and…
When was CVE-2020-37056 disclosed?
CVE-2020-37056 was first published in the National Vulnerability Database on January 30, 2026, with the most recent update on July 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2020-37056 actively exploited?
CVE-2020-37056 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 56.0% of all scored CVEs.
What is the CVSS score of CVE-2020-37056?
CVE-2020-37056 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2020-37056?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-37056, 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-2020-37056

Explore →

Is Your Infrastructure Affected by CVE-2020-37056?

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

Start Free Scan →Browse All CVEs