CVE-2022-43393: Zyxel GS1350-12hp Firmware

High severity, CVSS 8.2. EPSS: 0.6% chance of exploitation in the next 30 days.

An improper check for unusual or exceptional conditions in the HTTP request processing function of Zyxel GS1920-24v2 firmware prior to V4.70(ABMH.8)C0, which could allow an unauthenticated attacker to corrupt the contents of the memory and result in a denial-of-service (DoS) condition on a vulnerable device.

Affected products

  • Zyxel GS1350-12hp Firmware: before 4.70\(abpj.5\)c0 (fixed in 4.70\(abpj.5\)c0)
  • Zyxel GS1350-18hp Firmware: before 4.70\(abpk.5\)c0 (fixed in 4.70\(abpk.5\)c0)
  • Zyxel GS1350-26hp Firmware: before 4.70\(abpl.5\)c0 (fixed in 4.70\(abpl.5\)c0)
  • Zyxel GS1350-6hp Firmware: before 4.70\(abpi.5\)c0 (fixed in 4.70\(abpi.5\)c0)
  • Zyxel GS1915-24e Firmware: before 4.70\(acdr.3\)c0 (fixed in 4.70\(acdr.3\)c0)
  • Zyxel GS1915-24ep Firmware: before 4.70\(acds.3\)c0 (fixed in 4.70\(acds.3\)c0)
  • Zyxel GS1915-8 Firmware: before 4.70\(acap.3\)c0 (fixed in 4.70\(acap.3\)c0)
  • Zyxel GS1915-8ep Firmware: before 4.70\(acaq.3\)c0 (fixed in 4.70\(acaq.3\)c0)
  • Zyxel GS1920-24hpv2 Firmware: before 4.70\(abmi.8\)c0 (fixed in 4.70\(abmi.8\)c0)
  • Zyxel GS1920-24v2 Firmware: before 4.70\(abmh.8\)c0 (fixed in 4.70\(abmh.8\)c0)
  • Zyxel GS1920-48hpv2 Firmware: before 4.70\(abmk.8\)c0 (fixed in 4.70\(abmk.8\)c0)
  • Zyxel GS1920-48v2 Firmware: before 4.70\(abmj.8\)c0 (fixed in 4.70\(abmj.8\)c0)
  • Zyxel GS2220-10 Firmware: before 4.70\(abro.6\)c0 (fixed in 4.70\(abro.6\)c0)
  • Zyxel GS2220-10hp Firmware: before 4.70\(abrp.6\)c0 (fixed in 4.70\(abrp.6\)c0)
  • Zyxel GS2220-28 Firmware: before 4.70\(abrq.6\)c0 (fixed in 4.70\(abrq.6\)c0)
  • Zyxel GS2220-28hp Firmware: before 4.70\(abrr.6\)c0 (fixed in 4.70\(abrr.6\)c0)
  • Zyxel GS2220-50 Firmware: before 4.70\(abrs.6\)c0 (fixed in 4.70\(abrs.6\)c0)
  • Zyxel GS2220-50hp Firmware: before 4.70\(abrt.6\)c0 (fixed in 4.70\(abrt.6\)c0)
  • Zyxel MGS3500-24s Firmware: before 4.10\(abbr.2\)c0 (fixed in 4.10\(abbr.2\)c0)
  • Zyxel MGS3520-28 Firmware: before 4.10\(aatn.5\)c0 (fixed in 4.10\(aatn.5\)c0); version 4.10(abqm.1)c0 only
  • Zyxel MGS3520-28f Firmware: before 4.10\(aatm.4\)c0 (fixed in 4.10\(aatm.4\)c0)
  • Zyxel MGS3530-28 Firmware: before 4.10\(acem.2\)c0 (fixed in 4.10\(acem.2\)c0); version 4.10(acfj.0)c0 only
  • Zyxel XGS1930-28 Firmware: before 4.70\(abht.5\)c0 (fixed in 4.70\(abht.5\)c0)
  • Zyxel XGS1930-28hp Firmware: before 4.70\(abhs.5\)c0 (fixed in 4.70\(abhs.5\)c0)
  • Zyxel XGS1930-52 Firmware: before 4.70\(abhu.5\)c0 (fixed in 4.70\(abhu.5\)c0)
  • and 20 more

Published 2023-01-11. Last modified 2026-06-17.