CVE-2021-47548

CRITICALNVD 9.89.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 1.4% (71st percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3
Trending — 3 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1.4%CVSS: 9.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

In the Linux kernel, the following vulnerability has been resolved:

ethernet: hisilicon: hns: hns_dsaf_misc: fix a possible array overflow in hns_dsaf_ge_srst_by_port()

The if statement: if (port >= DSAF_GE_NUM) return;

limits the value of port less than DSAF_GE_NUM (i.e., 8). However, if the value of port is 6 or 7, an array overflow could occur: port_rst_off = dsaf_dev->mac_cb[port]->port_rst_off;

because the length of dsaf_dev->mac_cb is DSAF_MAX_PORT_NUM (i.e., 6).

To fix this possible array overflow, we first check port and if it is greater than or equal to DSAF_MAX_PORT_NUM, the function returns.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
60
EG Risk 60/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity98% × 45%
Impact severity (EG Severity): CVSS 9.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation1.4% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
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
1.4%
EPSS %ILE
71st
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (9.8): severity, escalated by confirmed exploitation. This CVE's 9.8 is its impact severity (EG Severity), not escalated.

EG Severity
9.8 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
EG Likelihood
1.4% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-22). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 3 days if the affected system is publicly exposed; 60 days if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track 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 total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)3 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

May 24, 2024

Last Modified

April 1, 2025

Advisory Details (7)

Auto-updated Oct 10, 2026
Patch available.
Web page

ethernet: hisilicon: hns: hns_dsaf_misc: fix a possible array overflow in hns_dsaf_ge_srst_by_port() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/99bb25cb6753beaf2c2bc37927c2ecc0ceff3f6d
Web page

ethernet: hisilicon: hns: hns_dsaf_misc: fix a possible array overflow in hns_dsaf_ge_srst_by_port() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/948968f8747650447c8f21c9fdba0e1973be040b
Web page

ethernet: hisilicon: hns: hns_dsaf_misc: fix a possible array overflow in hns_dsaf_ge_srst_by_port() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/22519eff7df2d88adcc2568d86046ce1e2b52803
Web page

ethernet: hisilicon: hns: hns_dsaf_misc: fix a possible array overflow in hns_dsaf_ge_srst_by_port() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/fc7ffa7f10b9454a86369405d9814bf141b30627
Web page

ethernet: hisilicon: hns: hns_dsaf_misc: fix a possible array overflow in hns_dsaf_ge_srst_by_port() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/dd07f8971b81ad98cc754b179b331b57f35aa1ff
Web page

ethernet: hisilicon: hns: hns_dsaf_misc: fix a possible array overflow in hns_dsaf_ge_srst_by_port() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/abbd5faa0748d0aa95d5191d56ff7a17a6275bd1
Web page

ethernet: hisilicon: hns: hns_dsaf_misc: fix a possible array overflow in hns_dsaf_ge_srst_by_port() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/a66998e0fbf213d47d02813b9679426129d0d114

Patch Availability(7)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatkernel-0:4.18.0-553.16.1.el8_102024-08-08redhat
redhatkernel-rt-0:4.18.0-553.16.1.rt7.357.el8_102024-08-08redhat
redhatkernel-0:4.18.0-372.113.1.el8_62024-07-29redhat
redhatkernel-0:4.18.0-477.64.1.el8_82024-07-23redhat
redhatkernel-0:5.14.0-427.26.1.el9_42024-07-17redhat
redhatkernel-0:5.14.0-284.73.1.el9_22024-07-15redhat
redhatkernel-rt-0:5.14.0-284.73.1.rt14.358.el9_22024-07-15redhat

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

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
linux5.10.46-4, 5.10.46-5, 5.10.70-1, 5.10.70-1~bpo10+1
  • every version up to 5.10.84-1: fixed in 5.10.84-1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 5.15.15-1: fixed in 5.15.15-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 5.15.15-1: fixed in 5.15.15-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 5.15.15-1: fixed in 5.15.15-1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 19× in last 7d / 50× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 97 of 213 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 3 repeat rows among the latest 100 are merged into the row they repeat. The 116 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-23 16:28 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  2. 2026-10-22 22:08 UTCEG score recompute
  3. 2026-10-22 22:08 UTCVendor advisory
  4. 2026-10-22 16:29 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  5. 2026-10-21 19:58 UTCEG score recompute
  6. 2026-10-21 19:58 UTCVendor advisory
  7. 2026-10-21 16:28 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  8. 2026-10-20 17:57 UTCEG score recompute
  9. 2026-10-20 17:57 UTCVendor advisory
  10. 2026-10-20 16:28 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  11. 2026-10-19 16:28 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  12. 2026-10-19 15:56 UTCEG score recompute
  13. 2026-10-19 15:56 UTCVendor advisory
  14. 2026-10-18 16:28 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  15. 2026-10-18 13:53 UTCVendor advisory
  16. 2026-10-18 08:49 UTCEG score recompute
  17. 2026-10-17 16:29 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  18. 2026-10-17 11:52 UTCEG score recompute
  19. 2026-10-17 11:52 UTCVendor advisory
  20. 2026-10-16 16:34 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  21. 2026-10-16 09:49 UTCEG score recompute
  22. 2026-10-16 09:49 UTCVendor advisory
  23. 2026-10-15 16:28 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  24. 2026-10-15 07:49 UTCEG score recompute
  25. 2026-10-15 07:49 UTCVendor advisory
Show 72 more
  1. 2026-10-14 16:29 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  2. 2026-10-14 03:48 UTCEG score recompute
  3. 2026-10-14 03:48 UTCVendor advisory
  4. 2026-10-13 16:28 UTCEPSS rescoreEPSS 1.4% · 70th percentile
  5. 2026-10-12 23:43 UTCVendor advisory
  6. 2026-10-12 19:05 UTCEG score recompute
  7. 2026-10-12 16:30 UTCEPSS rescoreEPSS 1.4% · 70th percentile
  8. 2026-10-11 23:31 UTCEG score recompute
  9. 2026-10-11 13:44 UTCEPSS rescoreEPSS 1.4% · 70th percentile
  10. 2026-10-10 23:17 UTCOSV refresh
  11. 2026-10-10 19:56 UTCEPSS rescoreEPSS 1.4% · 70th percentile
  12. 2026-10-09 20:04 UTCEPSS rescoreEPSS 1.4% · 70th percentile
  13. 2026-10-08 16:40 UTCEPSS rescoreEPSS 1.4% · 70th percentile
  14. 2026-10-07 23:45 UTCEPSS rescoreEPSS 1.4% · 70th percentile
  15. 2026-10-06 15:14 UTCEPSS rescoreEPSS 1.4% · 70th percentile
  16. 2026-10-05 17:40 UTCEPSS rescoreEPSS 1.4% · 70th percentile
  17. 2026-10-03 14:22 UTCEPSS rescoreEPSS 1.4% · 70th percentile
  18. 2026-10-02 16:23 UTCEPSS rescoreEPSS 1.4% · 70th percentile
  19. 2026-09-30 15:45 UTCEG score recompute
  20. 2026-09-30 15:00 UTCEPSS rescoreEPSS 1.4% · 70th percentile
  21. 2026-09-29 15:15 UTCEPSS rescoreEPSS 1.4% · 70th percentile
  22. 2026-09-28 13:47 UTCEPSS rescoreEPSS 1.4% · 70th percentile
  23. 2026-09-26 15:54 UTCEPSS rescoreEPSS 1.4% · 70th percentile
  24. 2026-09-26 00:21 UTCEPSS rescoreEPSS 1.4% · 70th percentile
  25. 2026-09-24 14:00 UTCEPSS rescoreEPSS 1.4% · 70th percentile
  26. 2026-09-23 13:45 UTCEPSS rescoreEPSS 1.4% · 70th percentile
  27. 2026-09-22 14:44 UTCEPSS rescoreEPSS 1.4% · 70th percentile
  28. 2026-09-21 20:28 UTCEPSS rescoreEPSS 1.4% · 70th percentile
  29. 2026-09-21 11:19 UTCOSV refresh
  30. 2026-09-20 20:13 UTCEPSS rescoreEPSS 1.4% · 70th percentile
  31. 2026-09-19 15:38 UTCEPSS rescoreEPSS 1.4% · 70th percentile
  32. 2026-09-18 19:24 UTCEPSS rescoreEPSS 1.4% · 70th percentile
  33. 2026-09-17 19:23 UTCEPSS rescoreEPSS 1.4% · 70th percentile
  34. 2026-09-16 14:05 UTCEPSS rescoreEPSS 1.4% · 70th percentile
  35. 2026-09-15 03:06 UTCEPSS rescoreEPSS 1.4% · 70th percentile
  36. 2026-09-12 14:57 UTCEPSS rescoreEPSS 1.4% · 70th percentile
  37. 2026-09-11 14:49 UTCEPSS rescoreEPSS 1.4% · 70th percentile
  38. 2026-09-11 09:33 UTCEPSS rescoreEPSS 1.4% · 70th percentile
  39. 2026-09-08 21:57 UTCEPSS rescoreEPSS 1.4% · 69th percentile
  40. 2026-09-07 15:58 UTCEPSS rescoreEPSS 1.4% · 69th percentile
  41. 2026-09-06 13:45 UTCEPSS rescoreEPSS 1.4% · 69th percentile
  42. 2026-09-05 15:25 UTCEPSS rescoreEPSS 1.4% · 69th percentile
  43. 2026-09-04 13:57 UTCEPSS rescoreEPSS 1.4% · 69th percentile
  44. 2026-09-04 05:03 UTCEPSS rescoreEPSS 1.4% · 69th percentile
  45. 2026-09-02 14:09 UTCEPSS rescoreEPSS 1.4% · 69th percentile
  46. 2026-09-02 09:14 UTCOSV refresh
  47. 2026-09-01 13:51 UTCEPSS rescoreEPSS 1.4% · 69th percentile
  48. 2026-08-30 19:14 UTCEPSS rescoreEPSS 1.4% · 69th percentile
  49. 2026-08-30 01:19 UTCEPSS rescoreEPSS 1.4% · 69th percentile
  50. 2026-08-28 21:38 UTCEPSS rescoreEPSS 1.4% · 69th percentile
  51. 2026-08-27 14:22 UTCEPSS rescoreEPSS 1.4% · 69th percentile
  52. 2026-08-26 14:43 UTCEPSS rescoreEPSS 1.4% · 69th percentile
  53. 2026-08-25 13:46 UTCEPSS rescoreEPSS 1.4% · 69th percentile
  54. 2026-08-24 14:13 UTCEPSS rescoreEPSS 1.4% · 69th percentile
  55. 2026-08-21 23:46 UTCEPSS rescoreEPSS 1.4% · 69th percentile
  56. 2026-08-20 22:52 UTCEPSS rescoreEPSS 1.4% · 69th percentile
  57. 2026-08-19 17:01 UTCEPSS rescoreEPSS 1.4% · 69th percentile
  58. 2026-08-18 13:45 UTCEPSS rescoreEPSS 1.4% · 69th percentile
  59. 2026-08-17 13:44 UTCEPSS rescoreEPSS 1.4% · 69th percentile
  60. 2026-08-16 14:53 UTCEPSS rescoreEPSS 1.4% · 69th percentile
  61. 2026-08-16 07:58 UTCOSV refresh
  62. 2026-08-16 02:11 UTCEPSS rescoreEPSS 1.4% · 69th percentile
  63. 2026-08-15 01:27 UTCEPSS rescoreEPSS 1.4% · 69th percentile
  64. 2026-08-13 21:57 UTCEPSS rescoreEPSS 1.4% · 69th percentile
  65. 2026-08-12 13:48 UTCEPSS rescoreEPSS 1.4% · 69th percentile
  66. 2026-08-11 13:38 UTCEPSS rescoreEPSS 1.4% · 69th percentile
  67. 2026-08-09 13:44 UTCEPSS rescoreEPSS 1.4% · 69th percentile
  68. 2026-08-08 16:34 UTCEPSS rescoreEPSS 1.4% · 69th percentile
  69. 2026-08-07 16:24 UTCEPSS rescoreEPSS 1.4% · 69th percentile
  70. 2026-08-06 13:44 UTCEPSS rescoreEPSS 1.4% · 69th percentile
  71. 2026-08-05 19:15 UTCEPSS rescoreEPSS 1.4% · 68th percentile
  72. 2026-08-04 15:06 UTCEPSS rescoreEPSS 1.4% · 68th percentile

Frequently asked(5)

What is CVE-2021-47548?
CVE-2021-47548 is a critical-severity vulnerability; its CVE record was published on May 24, 2024. In the Linux kernel, the following vulnerability has been resolved: ethernet: hisilicon: hns: hnsdsafmisc: fix a possible array overflow in hnsdsafgesrstby_port() The if statement: if (port >= DSAFGENUM) return; limits the value of port less than DSAFGENUM (i.e., 8). However, if the value of port…
When was the CVE record for CVE-2021-47548 published?
The CVE record for CVE-2021-47548 was published on May 24, 2024. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of April 1, 2025; the record at its source may have been updated since.
Is CVE-2021-47548 actively exploited?
CVE-2021-47548 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.4% probability of exploitation in the next 30 days (71st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2021-47548?
CVE-2021-47548 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2021-47548?
A fix for CVE-2021-47548 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2021-47548 are linked in the Vendor Advisories panel on this page.

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