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Medium severity6.1NVD Advisory· Published May 24, 2022· Updated Jun 17, 2026

CVE-2022-26531

CVE-2022-26531

Description

Multiple improper input validation flaws were identified in some CLI commands of Zyxel USG/ZyWALL series firmware versions 4.09 through 4.71, USG FLEX series firmware versions 4.50 through 5.21, ATP series firmware versions 4.32 through 5.21, VPN series firmware versions 4.30 through 5.21, NSG series firmware versions 1.00 through 1.33 Patch 4, NXC2500 firmware version 6.10(AAIG.3) and earlier versions, NAP203 firmware version 6.25(ABFA.7) and earlier versions, NWA50AX firmware version 6.25(ABYW.5) and earlier versions, WAC500 firmware version 6.30(ABVS.2) and earlier versions, and WAX510D firmware version 6.30(ABTF.2) and earlier versions, that could allow a local authenticated attacker to cause a buffer overflow or a system crash via a crafted payload.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

20
  • Zyxel/NAP203llm-create
    Range: <=6.25(ABFA.7)
  • Zyxel/VPN seriesllm-fuzzy2 versions
    4.30 - 5.21+ 1 more
    • (no CPE)range: 4.30 - 5.21
    • (no CPE)range: 4.30 through 5.21
  • Zyxel/ZyWALL/USG seriesllm-fuzzy2 versions
    4.09 - 4.71+ 1 more
    • (no CPE)range: 4.09 - 4.71
    • (no CPE)range: 4.09 through 4.71
  • Zyxel/NWA50AXllm-fuzzy
    Range: <=6.25(ABYW.5)
  • Zyxel/NXC2500llm-fuzzy
    Range: <=6.10(AAIG.3)
  • Zyxel/NSG seriesllm-fuzzy
    Range: 1.00 - 1.33 Patch 4
  • Zyxel/WAX510Dllm-fuzzy
    Range: <=6.30(ABTF.2)
  • Zyxel/ATP seriesllm-fuzzy2 versions
    4.32 - 5.21+ 1 more
    • (no CPE)range: 4.32 - 5.21
    • (no CPE)range: 4.32 through 5.21
  • Zyxel/USG FLEX seriesllm-fuzzy2 versions
    4.50 - 5.21+ 1 more
    • (no CPE)range: 4.50 - 5.21
    • (no CPE)range: 4.50 through 5.21
  • Zyxel/WAC500llm-fuzzy
    Range: <=6.30(ABVS.2)
  • Zyxel/NAP203 firmwarev5
    Range: <= 6.25(ABFA.7)
  • Zyxel/NSG series firmwarev5
    Range: 1.00 through 1.33 Patch 4
  • Zyxel/NWA50AX firmwarev5
    Range: <= 6.25(ABYW.5)
  • Zyxel/NXC2500 firmwarev5
    Range: <= 6.10(AAIG.3)
  • Zyxel/WAC500 firmwarev5
    Range: <= 6.30(ABVS.2)
  • Zyxel/WAX510D firmwarev5
    Range: <= 6.30(ABTF.2)

Patches

Vulnerability mechanics

References

4

News mentions

0

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