CVE-2021-27364

HIGHNVD 7.17.1—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.1 under NVD CVSS v3. EPSS exploit probability: 1.0%, top 42% 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
7.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 7.1Exploit: None knownExposed: 0

A fix is available — apply it.

An issue was discovered in the Linux kernel through 5.11.3. drivers/scsi/scsi_transport_iscsi.c is adversely affected by the ability of an unprivileged user to craft Netlink messages.

CVSS v3
7.1
EG Score
7.1(medium)
EG Risk
37(Track)
EG Risk 37/100SSVC: 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
Severity71% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
60%
KEV
Not listed

Published

March 7, 2021

Last Modified

July 30, 2026

Advisory Details (6)

Auto-updated Jul 30, 2026
Patch available.
generic

oss-security - Linux iscsi security fixes

https://www.openwall.com/lists/oss-security/2021/03/06/1
generic

NetApp Product Security

https://security.netapp.com/advisory/ntap-20210409-0001/
generic Patch Available

[SECURITY] [DLA 2610-1] linux-4.19 security update

https://lists.debian.org/debian-lts-announce/2021/03/msg00035.html
generic Patch Available

[SECURITY] [DLA 2586-1] linux security update

https://lists.debian.org/debian-lts-announce/2021/03/msg00010.html
generic

scsi: iscsi: Restrict sessions and handles to admin capabilities - kernel/git/torvalds/linux.git - Linux kernel source tree

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=688e8128b7a92df982709a4137ea4588d16f24aa
generic

Making sure you're not a bot!

https://bugzilla.suse.com/show_bug.cgi?id=1182717

Vendor Advisories for CVE-2021-27364(20)

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

Patch Availability(19)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-image-azure (4.15.0.1110.83) @ trusty2026-05-26ubuntu
ubuntulinux-image-generic-lts-trusty (3.13.0.185.170) @ precise2026-05-26ubuntu
ubuntulinux-image-virtual-lts-xenial (4.4.0.206.179) @ trusty2026-05-26ubuntu
ubuntulinux-image-virtual-hwe-20.04-edge (5.8.0.48.53) @ groovy2026-05-26ubuntu
redhatkpatch-patch2021-05-11redhat
redhatkernel-0:3.10.0-1062.49.1.el72021-05-11redhat
redhatkernel-alt-0:4.14.0-115.36.1.el7a2021-04-27redhat
redhatkernel-0:3.10.0-957.72.1.el72021-04-27redhat
redhatkernel-0:3.10.0-514.88.1.el72021-04-27redhat
redhatkernel-0:4.18.0-193.51.1.el8_22021-04-20redhat
redhatkernel-0:3.10.0-693.84.1.el72021-04-20redhat
redhatkernel-rt-0:4.18.0-193.51.1.rt13.101.el8_22021-04-20redhat
redhatkernel-0:2.6.32-754.39.1.el62021-04-20redhat
redhatkernel-0:3.10.0-327.96.1.el72021-04-20redhat
redhatkernel-0:4.18.0-147.44.1.el8_12021-04-13redhat
redhatkernel-0:3.10.0-1160.24.1.el72021-04-08redhat
redhatkernel-rt-0:4.18.0-240.22.1.rt7.77.el8_32021-04-06redhat
redhatkernel-0:4.18.0-240.22.1.el8_32021-04-06redhat
redhatkernel-rt-0:3.10.0-1160.24.1.rt56.1161.el72021-04-06redhat

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 5 ecosystems)
Debian:9(2)
PackageVulnerable rangeFixed inDependents
linux4.9.107-1 ... 4.9.88-1~bpo8+1 (65 versions)4.9.258-1—
linux-4.194.19.132-1~deb9u1 ... 4.19.171-2~deb9u1 (6 versions)4.19.181-1~deb9u1—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
linux—5.10.24-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux—5.10.24-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux—5.10.24-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux—5.10.24-1—

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 8× 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 169 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2021-27364?
CVE-2021-27364 is a high vulnerability published on March 7, 2021. An issue was discovered in the Linux kernel through 5.11.3. drivers/scsi/scsitransportiscsi.c is adversely affected by the ability of an unprivileged user to craft Netlink messages.
When was CVE-2021-27364 disclosed?
CVE-2021-27364 was first published in the National Vulnerability Database on March 7, 2021, with the most recent update on July 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-27364 actively exploited?
CVE-2021-27364 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 40.1% of all scored CVEs.
What is the CVSS score of CVE-2021-27364?
CVE-2021-27364 has a CVSS v3 base score of 7.1 (NVD).
How do I remediate CVE-2021-27364?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-27364, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2021-27364

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