CVE-2021-27365

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.8 under NVD CVSS v3. EPSS exploit probability: 2.1%, top 20% 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
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2%CVSS: 7.8Exploit: None knownExposed: 0

A fix is available — apply it.

An issue was discovered in the Linux kernel through 5.11.3. Certain iSCSI data structures do not have appropriate length constraints or checks, and can exceed the PAGE_SIZE value. An unprivileged user can send a Netlink message that is associated with iSCSI, and has a length up to the maximum length of a Netlink message.

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity78% × 45%
Exploitation2% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
2%
EPSS %ILE
80%
KEV
Not listed

Published

March 7, 2021

Last Modified

July 30, 2026

Advisory Details (7)

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: Verify lengths on passthrough PDUs - kernel/git/torvalds/linux.git - Linux kernel source tree

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f9dbdf97a5bd92b1a49cee3d591b55b11fd7a6d5
generic

scsi: iscsi: Ensure sysfs attributes are limited to PAGE_SIZE - kernel/git/torvalds/linux.git - Linux kernel source tree

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ec98ea7070e94cc25a422ec97d1421e28d97b7ee
generic

Making sure you're not a bot!

https://bugzilla.suse.com/show_bug.cgi?id=1182715

Vendor Advisories for CVE-2021-27365(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-virtual-hwe-20.04-edge (5.8.0.48.53) @ groovy2026-05-26ubuntu
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
redhatkpatch-patch2021-05-11redhat
redhatkernel-0:3.10.0-1062.49.1.el72021-05-11redhat
redhatkernel-0:3.10.0-514.88.1.el72021-04-27redhat
redhatkernel-alt-0:4.14.0-115.36.1.el7a2021-04-27redhat
redhatkernel-0:3.10.0-957.72.1.el72021-04-27redhat
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-0:3.10.0-693.84.1.el72021-04-20redhat
redhatkernel-0:4.18.0-193.51.1.el8_22021-04-20redhat
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-rt-0:3.10.0-1160.24.1.rt56.1161.el72021-04-06redhat
redhatkernel-0:4.18.0-240.22.1.el8_32021-04-06redhat

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 9× 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.

Showing the most recent 100 of 136 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2021-27365?
CVE-2021-27365 is a high vulnerability published on March 7, 2021. An issue was discovered in the Linux kernel through 5.11.3. Certain iSCSI data structures do not have appropriate length constraints or checks, and can exceed the PAGE_SIZE value. An unprivileged user can send a Netlink message that is associated with iSCSI, and has a length up to the maximum…
When was CVE-2021-27365 disclosed?
CVE-2021-27365 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-2021-27365 actively exploited?
CVE-2021-27365 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2% probability of exploitation in the next 30 days, which ranks it in the top 20.0% of all scored CVEs.
What is the CVSS score of CVE-2021-27365?
CVE-2021-27365 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2021-27365?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-27365, 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-2021-27365

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