CVE-2022-26531

mediumpriority · track · 33EPSS 0.062 · 93 %ileEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

6.17% (93rd) EPSS

CVSS 4.6 · medium

Is it mine?

114 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · fstec_bdu

EPSS · scored 2026-10-27

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.

cvss

Technical severity, 0–10. One row per scoring source.

7.8

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 4.6–7.8

v2.04.6mediumAV:L/AC:L/Au:N/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 3.9 · impact 6.4

v3.17.8highCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 1.8 · impact 5.9

v3.16.1mediumAV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:Hsecondary · FSTEC (BDU) RU

v3.16.1mediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:Hsecondary · ENISA EU

v3.16.1mediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:Hsecondary · security@zyxel.com.twexploitability 1.8 · impact 4.2

v3.17.1highCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-20USprimaryCWE-20US

affected products (114)

Products and version ranges known to be affected.

Zyxel ATP series firmware≤ 4.32 through 5.21enisa_euvdEU
Zyxel NAP203 firmware≤ ≤ 6.25(ABFA.7)enisa_euvdEU
Zyxel NSG series firmware≤ 1.00 through 1.33 Patch 4enisa_euvdEU
Zyxel NWA50AX firmware≤ ≤ 6.25(ABYW.5)enisa_euvdEU
Zyxel NXC2500 firmware≤ ≤ 6.10(AAIG.3)enisa_euvdEU
Zyxel USG FLEX series firmware≤ 4.50 through 5.21enisa_euvdEU
Zyxel USG/Zywall series Firmware≤ 4.09 through 4.71enisa_euvdEU
Zyxel VPN series Firmware≤ 4.30 through 5.21enisa_euvdEU
Zyxel WAC500 firmware≤ ≤ 6.30(ABVS.2)enisa_euvdEU
Zyxel WAX510D firmware≤ ≤ 6.30(ABTF.2)enisa_euvdEU
Zyxel Communications Corp. ATP≤ ZLD 5.30fstec_bduRU
Zyxel Communications Corp. NAP203≤ 6.25(ABFA.8)fstec_bduRU
Zyxel Communications Corp. NAP303≤ 6.25(ABEX.8)fstec_bduRU
Zyxel Communications Corp. NAP353≤ 6.25(ABEY.8)fstec_bduRU
Zyxel Communications Corp. NSG≤ 1.33 Patch 5fstec_bduRU
Zyxel Communications Corp. NWA1123-AC HD≤ 6.25(ABIN.8)fstec_bduRU
Zyxel Communications Corp. NWA1123-AC PRO≤ 6.25(ABHD.8)fstec_bduRU
Zyxel Communications Corp. NWA1302-AC≤ 6.25(ABKU.8)fstec_bduRU
Zyxel Communications Corp. NWA5123-AC HD≤ 6.25(ABIM.8)fstec_bduRU
Zyxel Communications Corp. NXC2500≤ 6.10(AAIG.3)fstec_bduRU

showing 20 of 114

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu NVD CVE.org MITRE

published 2022-05-24modified 2026-06-17

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+25171 more

references (14)

External citations — patches, advisories, analysis.

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