CVE-2021-37137

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 6.6% (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
Trending — 3 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 6.6%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

The Snappy frame decoder function doesn't restrict the chunk length which may lead to excessive memory usage. Beside this it also may buffer reserved skippable chunks until the whole chunk was received which may lead to excessive memory usage as well. This vulnerability can be triggered by supplying malicious input that decompresses to a very big size (via a network stream or a file) or by sending a huge skippable chunk.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
51
EG Risk 51/100CISA 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
Severity75% × 45%
Exploitation7% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; 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
6.6%
EPSS %ILE
93rd
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; 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 (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). 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

October 19, 2021

Last Modified

October 8, 2026

Advisory Details (8)

Auto-updated Oct 8, 2026
Patch available. Sources: github.
generic

NetApp Product Security

https://security.netapp.com/advisory/ntap-20220210-0012/
generic

Pony Mail

https://lists.apache.org/thread.html/rd262f59b1586a108e320e5c966feeafbb1b8cdc96965debc7cc10b16%40%3Ccommits.druid.apache.org%3E
generic

Pony Mail

https://lists.apache.org/thread.html/r06a145c9bd41a7344da242cef07977b24abe3349161ede948e30913d%40%3Ccommits.druid.apache.org%3E
generic

Pony Mail

https://lists.apache.org/thread.html/r5e05eba32476c580412f9fbdfc9b8782d5b40558018ac4ac07192a04%40%3Ccommits.druid.apache.org%3E
generic

Pony Mail

https://lists.apache.org/thread.html/r5406eaf3b07577d233b9f07cfc8f26e28369e6bab5edfcab41f28abb%40%3Ccommits.druid.apache.org%3E
generic

Pony Mail

https://lists.apache.org/thread.html/r75490c61c2cb7b6ae2c81238fd52ae13636c60435abcd732d41531a0%40%3Ccommits.druid.apache.org%3E
generic

Pony Mail

https://lists.apache.org/thread.html/rfb2bf8597e53364ccab212fbcbb2a4e9f0a9e1429b1dc08023c6868e%40%3Cdev.tinkerpop.apache.org%3E
githubMentions a patch (unverified)

SnappyFrameDecoder doesn't restrict chunk length any may buffer skippable chunks in an unnecessary way · Advisory · netty/netty · GitHub

https://github.com/netty/netty/security/advisories/GHSA-9vjp-v76f-g363

Vendor Advisories for CVE-2021-37137(19)

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

Patch Availability(17)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulibnetty-java (1:4.1.45-1ubuntu0.1~esm1) @ focal2026-10-08ubuntu
redhateap7-wildfly-openssl-linux-0:1.0.12-6.Final_redhat_00001.1.ep7.el72025-06-25redhat
redhateap7-wildfly-elytron-0:1.10.17-1.Final_redhat_00001.1.el7eap2025-06-25redhat
redhatpatch2023-09-14redhat
redhatpatch2023-05-18redhat
redhatcandlepin-0:4.1.15-1.el8sat2022-11-16redhat
redhatnetty-codec2022-10-06redhat
redhateap7-netty-0:4.1.72-4.Final_redhat_00001.1.el8eap2022-06-06redhat
redhatio.netty/netty-codec:4.1.72.Final-redhat-000012022-06-06redhat
redhateap7-netty-0:4.1.72-4.Final_redhat_00001.1.el7eap2022-06-06redhat
redhatopenshift-logging/elasticsearch6-rhel8:v6.8.1-1592022-05-11redhat
redhatopenshift-logging/elasticsearch6-rhel8:v6.8.1-1562022-05-11redhat
redhatopenshift-logging/elasticsearch6-rhel8:v6.8.1-1572022-05-11redhat
redhatpatch2022-03-22redhat
redhatopenshift-logging/elasticsearch6-rhel8:v6.8.1-672021-12-14redhat
redhatopenshift-logging/elasticsearch6-rhel8:v6.8.1-662021-12-14redhat
redhatopenshift-logging/elasticsearch6-rhel8:v6.8.1-652021-12-14redhat

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

(8 across 6 ecosystems)
Maven(3)
PackageVulnerable rangeFix by version rangeDependents
io.netty:netty3.10.0.Final ... 4.0.0.Alpha8 (71 versions)
  • every version on: no fix on record
—
io.netty:netty-codec4.0.0.Final ... 4.1.9.Final (141 versions)
  • 4.0.0 up to 4.1.68.Final: fixed in 4.1.68.Final
—
org.jboss.netty:netty3.0.0.CR1 ... 3.2.9.Final (39 versions)
  • every version on: no fix on record
—
Debian:10(1)
PackageVulnerable rangeFix by version rangeDependents
netty1:4.1.33-1, 1:4.1.33-1+deb10u1, 1:4.1.33-1+deb10u2
  • every version up to 1:4.1.33-1+deb10u3: fixed in 1:4.1.33-1+deb10u3
—
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
netty1:4.1.48-4
  • every version up to 1:4.1.48-4+deb11u1: fixed in 1:4.1.48-4+deb11u1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
netty—
  • every version up to 1:4.1.48-6: fixed in 1:4.1.48-6
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
netty—
  • every version up to 1:4.1.48-6: fixed in 1:4.1.48-6
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
netty—
  • every version up to 1:4.1.48-6: fixed in 1:4.1.48-6
—

Weakness Classification(1)

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

Additional Vendor Advisories

(5)

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

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Frequently asked(5)

What is CVE-2021-37137?
CVE-2021-37137 is a high vulnerability published on October 19, 2021. The Snappy frame decoder function doesn't restrict the chunk length which may lead to excessive memory usage. Beside this it also may buffer reserved skippable chunks until the whole chunk was received which may lead to excessive memory usage as well. This vulnerability can be triggered by…
When was CVE-2021-37137 disclosed?
CVE-2021-37137 was first published on October 19, 2021, with the most recent update on October 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-37137 actively exploited?
CVE-2021-37137 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 6.6% probability of exploitation in the next 30 days (93rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2021-37137?
CVE-2021-37137 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2021-37137?
A fix for CVE-2021-37137 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2021-37137 are linked in the Vendor Advisories panel on this page.

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