CVE-2026-71920 (GCVE-0-2026-71920)

Vulnerability from cvelistv5 – Published: 2026-08-24 17:07 – Updated: 2026-08-24 18:17
VLAI
Title
DrayTek VigorSwitch Multiple Models NULL Pointer Dereference via formlogout
Summary
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.
Severity
6.9 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
4.9 (Medium)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-24 18:17 UTC
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version CPE status
DrayTek Corporation VigorSwitch G2540xs Affected: 0 , < 3.9.10 (custom)
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DrayTek Corporation VigorSwitch P2540xs Affected: 0 , < 3.9.10 (custom)
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DrayTek Corporation VigorSwitch FX2120 Affected: 0 , < 3.9.10 (custom)
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DrayTek Corporation VigorSwitch G2282x Affected: 0 , < 2.10.6 (custom)
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DrayTek Corporation VigorSwitch P2282x Affected: 0 , < 2.10.6 (custom)
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DrayTek Corporation VigorSwitch Q2300x Affected: 0 , < 2.10.7 (custom)
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DrayTek Corporation VigorSwitch PQ2300xb Affected: 0 , < 2.10.7 (custom)
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DrayTek Corporation VigorSwitch G2542x Affected: 0 , < 3.10.6 (custom)
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DrayTek Corporation VigorSwitch P2542x Affected: 0 , < 3.10.6 (custom)
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DrayTek Corporation VigorSwitch P2542xh Affected: 0 , < 3.10.6 (custom)
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DrayTek Corporation VigorSwitch PX2060 Affected: 0 , < 2.9.10 (custom)
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DrayTek Corporation VigorSwitch G1280 Affected: 0 , < 2.9.10 (custom)
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DrayTek Corporation VigorSwitch P1280 Affected: 0 , < 2.9.10 (custom)
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DrayTek Corporation VigorSwitch P1281x Affected: 0 , < 2.9.10 (custom)
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DrayTek Corporation VigorSwitch G1282 Affected: 0 , < 2.9.10 (custom)
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DrayTek Corporation VigorSwitch P1282 Affected: 0 , < 2.9.10 (custom)
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DrayTek Corporation VigorSwitch G2121 Affected: 0 , < 2.9.10 (custom)
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DrayTek Corporation VigorSwitch P2121 Affected: 0 , < 2.9.10 (custom)
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DrayTek Corporation VigorSwitch PQ2121x Affected: 0 , < 2.9.10 (custom)
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DrayTek Corporation VigorSwitch Q2121x Affected: 0 , < 2.9.10 (custom)
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DrayTek Corporation VigorSwitch G2280x Affected: 0 , < 2.9.10 (custom)
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DrayTek Corporation VigorSwitch P2280x Affected: 0 , < 2.9.10 (custom)
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DrayTek Corporation VigorSwitch Q2200x Affected: 0 , < 2.9.10 (custom)
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DrayTek Corporation VigorSwitch PQ2200xb Affected: 0 , < 2.9.10 (custom)
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DrayTek Corporation VigorSwitch G2100 Affected: 0 , < 2.9.10 (custom)
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DrayTek Corporation VigorSwitch P2100 Affected: 0 , < 2.9.10 (custom)
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DrayTek Corporation VigorSwitch G2540x Affected: 0 , < 2.9.10 (custom)
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DrayTek Corporation VigorSwitch P2540x Affected: 0 , < 2.9.10 (custom)
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Date Public
2026-08-24 00:00
Credits
Jincheng Wang (@winmt) Le Yu (Nanjing University of Posts and Telecommunications) Xiapu Luo (The Hong Kong Polytechnic University)
Show details on NVD website
To clipboard 

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    "vulnrichment": {
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  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.