CVE-2026-71920

MEDIUMPre-NVD 4.94.9
EchelonGraph scoreMEDIUM confidence

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

Score 4.9 from GitHub Security Advisory published 2026-08-24. A secondary CVSS source baseline 4.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
Trending — 3 sources updated this week
4.9EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 4.9Exploit: None knownExposed services: Not assessed

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

The CVE record's CNA (VulnCheck) lists DrayTek Corporation VigorSwitch G2540xs versions before 3.9.10; DrayTek Corporation VigorSwitch P2540xs versions before 3.9.10; DrayTek Corporation VigorSwitch FX2120 versions before 3.9.10 as affected, and 5 more products. No release containing a fix is confirmed on record.

Multiple DrayTek VigorSwitch models contain a null pointer dereference vulnerability in the formlogout function. The vulnerability is caused by missing checks for an empty or absent Cookie header before string handling. A remote attacker can trigger this vulnerability via a crafted request to crash the service and cause a denial of service. Exploitation requires valid administrative credentials for the device's web management interface.

CVSS v3
4.9
EG Score
4.9MEDIUMmedium confidence
EG Risk
22
EG Risk 22/100

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 (value × EchelonGraph’s weight)
Severity49% × 45%
The EG Score, 4.9 of 10.
Exploitation0.6% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (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: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.6%
EPSS %ILE
44th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (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)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (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

August 24, 2026

Last Modified

October 13, 2026

Advisory Details (2)

Auto-updated Aug 24, 2026
No fix on record yet.
Web page

DrayTek VigorSwitch Multiple Models NULL Pointer Dereference via formlogout | Advisories | VulnCheck

https://www.vulncheck.com/advisories/draytek-vigorswitch-multiple-models-null-pointer-dereference-via-formlogout
Web page

Multiple Vulnerabilities in VigorSwitch Series | DrayTek

https://www.draytek.com/about/security-advisory/multiple-vulnerabilities-in-vigorswitch-series-august-2026/

Vendor Advisories for CVE-2026-71920(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 17× in last 7d / 72× 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 100 of 128 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. None are among the latest 100 rows. The 28 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  2. 2026-10-13 09:28 UTCEG score recompute
  3. 2026-10-13 09:28 UTCGHSA enrichmentGHSA-648m-vmc5-h63x · GitHub CVSS 4.9
  4. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  5. 2026-10-12 15:42 UTCEG score recompute
  6. 2026-10-11 19:28 UTCEG score recompute
  7. 2026-10-11 16:43 UTCEG score recompute
  8. 2026-10-11 14:03 UTCEG score recompute
  9. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  10. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  11. 2026-10-10 12:35 UTCEG score recompute
  12. 2026-10-10 12:34 UTCGHSA enrichmentGHSA-648m-vmc5-h63x · GitHub CVSS 4.9
  13. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  14. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  15. 2026-10-08 06:38 UTCEG score recompute
  16. 2026-10-08 06:38 UTCGHSA enrichmentGHSA-648m-vmc5-h63x · GitHub CVSS 4.9
  17. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  18. 2026-10-07 04:44 UTCEG score recompute
  19. 2026-10-07 04:44 UTCGHSA enrichmentGHSA-648m-vmc5-h63x · GitHub CVSS 4.9
  20. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  21. 2026-10-06 02:50 UTCEG score recompute
  22. 2026-10-06 02:50 UTCGHSA enrichmentGHSA-648m-vmc5-h63x · GitHub CVSS 4.9
  23. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  24. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  25. 2026-10-04 20:42 UTCGHSA enrichmentGHSA-648m-vmc5-h63x · GitHub CVSS 4.9
Show 75 more
  1. 2026-10-03 16:31 UTCEG score recompute
  2. 2026-10-03 16:31 UTCGHSA enrichmentGHSA-648m-vmc5-h63x · GitHub CVSS 4.9
  3. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  4. 2026-10-02 11:03 UTCEG score recompute
  5. 2026-10-02 11:03 UTCGHSA enrichmentGHSA-648m-vmc5-h63x · GitHub CVSS 4.9
  6. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  7. 2026-10-01 09:04 UTCEG score recompute
  8. 2026-10-01 09:04 UTCGHSA enrichmentGHSA-648m-vmc5-h63x · GitHub CVSS 4.9
  9. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  10. 2026-09-30 07:10 UTCEG score recompute
  11. 2026-09-30 07:10 UTCGHSA enrichmentGHSA-648m-vmc5-h63x · GitHub CVSS 4.9
  12. 2026-09-29 03:52 UTCEG score recompute
  13. 2026-09-29 03:52 UTCGHSA enrichmentGHSA-648m-vmc5-h63x · GitHub CVSS 4.9
  14. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  15. 2026-09-28 01:58 UTCEG score recompute
  16. 2026-09-28 01:58 UTCGHSA enrichmentGHSA-648m-vmc5-h63x · GitHub CVSS 4.9
  17. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  18. 2026-09-27 00:05 UTCEG score recompute
  19. 2026-09-27 00:05 UTCGHSA enrichmentGHSA-648m-vmc5-h63x · GitHub CVSS 4.9
  20. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  21. 2026-09-25 10:26 UTCEG score recompute
  22. 2026-09-25 10:26 UTCGHSA enrichmentGHSA-648m-vmc5-h63x · GitHub CVSS 4.9
  23. 2026-09-24 08:33 UTCEG score recompute
  24. 2026-09-24 08:33 UTCGHSA enrichmentGHSA-648m-vmc5-h63x · GitHub CVSS 4.9
  25. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  26. 2026-09-23 06:40 UTCEG score recompute
  27. 2026-09-23 06:40 UTCGHSA enrichmentGHSA-648m-vmc5-h63x · GitHub CVSS 4.9
  28. 2026-09-22 04:47 UTCEG score recompute
  29. 2026-09-22 04:47 UTCGHSA enrichmentGHSA-648m-vmc5-h63x · GitHub CVSS 4.9
  30. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  31. 2026-09-21 02:53 UTCEG score recompute
  32. 2026-09-21 02:53 UTCGHSA enrichmentGHSA-648m-vmc5-h63x · GitHub CVSS 4.9
  33. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  34. 2026-09-20 00:59 UTCEG score recompute
  35. 2026-09-20 00:59 UTCGHSA enrichmentGHSA-648m-vmc5-h63x · GitHub CVSS 4.9
  36. 2026-09-18 23:05 UTCEG score recompute
  37. 2026-09-18 23:05 UTCGHSA enrichmentGHSA-648m-vmc5-h63x · GitHub CVSS 4.9
  38. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  39. 2026-09-17 21:12 UTCEG score recompute
  40. 2026-09-17 21:12 UTCGHSA enrichmentGHSA-648m-vmc5-h63x · GitHub CVSS 4.9
  41. 2026-09-16 14:40 UTCEG score recompute
  42. 2026-09-16 14:40 UTCGHSA enrichmentGHSA-648m-vmc5-h63x · GitHub CVSS 4.9
  43. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  44. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  45. 2026-09-15 12:42 UTCEG score recompute
  46. 2026-09-15 12:42 UTCGHSA enrichmentGHSA-648m-vmc5-h63x · GitHub CVSS 4.9
  47. 2026-09-15 03:12 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  48. 2026-09-14 10:49 UTCEG score recompute
  49. 2026-09-14 10:49 UTCGHSA enrichmentGHSA-648m-vmc5-h63x · GitHub CVSS 4.9
  50. 2026-09-13 08:55 UTCEG score recompute
  51. 2026-09-13 08:55 UTCGHSA enrichmentGHSA-648m-vmc5-h63x · GitHub CVSS 4.9
  52. 2026-09-12 15:02 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  53. 2026-09-12 07:02 UTCEG score recompute
  54. 2026-09-12 07:02 UTCGHSA enrichmentGHSA-648m-vmc5-h63x · GitHub CVSS 4.9
  55. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  56. 2026-09-11 05:08 UTCEG score recompute
  57. 2026-09-11 05:08 UTCGHSA enrichmentGHSA-648m-vmc5-h63x · GitHub CVSS 4.9
  58. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  59. 2026-09-10 03:15 UTCGHSA enrichmentGHSA-648m-vmc5-h63x · GitHub CVSS 4.9
  60. 2026-09-09 01:22 UTCEG score recompute
  61. 2026-09-09 01:22 UTCGHSA enrichmentGHSA-648m-vmc5-h63x · GitHub CVSS 4.9
  62. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  63. 2026-09-07 17:32 UTCEG score recompute
  64. 2026-09-07 17:32 UTCGHSA enrichmentGHSA-648m-vmc5-h63x · GitHub CVSS 4.9
  65. 2026-09-06 15:39 UTCEG score recompute
  66. 2026-09-06 15:39 UTCGHSA enrichmentGHSA-648m-vmc5-h63x · GitHub CVSS 4.9
  67. 2026-09-06 13:48 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  68. 2026-09-05 13:45 UTCEG score recompute
  69. 2026-09-05 13:45 UTCGHSA enrichmentGHSA-648m-vmc5-h63x · GitHub CVSS 4.9
  70. 2026-09-04 11:52 UTCEG score recompute
  71. 2026-09-04 11:52 UTCGHSA enrichmentGHSA-648m-vmc5-h63x · GitHub CVSS 4.9
  72. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  73. 2026-09-03 09:58 UTCEG score recompute
  74. 2026-09-03 09:57 UTCGHSA enrichmentGHSA-648m-vmc5-h63x · GitHub CVSS 4.9
  75. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.4% · 32nd percentile

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-71920?
CVE-2026-71920 is a medium-severity vulnerability; its CVE record was published on August 24, 2026. Multiple DrayTek VigorSwitch models contain a null pointer dereference vulnerability in the formlogout function. The vulnerability is caused by missing checks for an empty or absent Cookie header before string handling. A remote attacker can trigger this vulnerability via a crafted request to crash…
When was CVE-2026-71920 made public?
CVE-2026-71920 was made public on August 24, 2026: that is the date its CVE record's CNA, VulnCheck, gives for when the vulnerability was made public. The CVE record itself was published on August 24, 2026. EchelonGraph's copy of the record carries a last-modified date of October 13, 2026; the record at its source may have been updated since.
Is CVE-2026-71920 actively exploited?
CVE-2026-71920 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (44th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-71920?
CVE-2026-71920 has a CVSS base score of 4.9 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-71920?
No fix for CVE-2026-71920 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The CVE record's CNA (VulnCheck) lists DrayTek Corporation VigorSwitch G2540xs versions before 3.9.10; DrayTek Corporation VigorSwitch P2540xs versions before 3.9.10; DrayTek Corporation VigorSwitch FX2120 versions before 3.9.10 as affected, and 5 more products. No release containing a fix is confirmed on record. The vendor advisories EchelonGraph has for CVE-2026-71920 are linked in the Vendor Advisories panel on this page.

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