CVE-2022-43393

CVE-2022-43393 is a high-severity vulnerability in Zyxel Gs1350-6hp Firmware with a CVSS 3.x base score of 8.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-754.

Key facts

• Severity: High (CVSS 3.x base score 8.2)
• EPSS exploit prediction: 1% (43rd percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-754
• Affected product: Zyxel Gs1350-6hp Firmware
• Published: 2023-01-11
• Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2022-43393?

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.

How severe is CVE-2022-43393?

CVE-2022-43393 has a CVSS 3.x base score of 8.2, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability high.

Is CVE-2022-43393 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2022-43393?

CVE-2022-43393 primarily affects Zyxel Gs1350-6hp Firmware. In total, 47 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2022-43393?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2022-43393 published?

CVE-2022-43393 was published on 2023-01-11 and last updated on 2026-06-17.

References

• https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-dos-vulnerability-of-switches

Affected products (47)

• cpe:2.3:o:zyxel:gs1350-6hp_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:gs1350-12hp_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:gs1350-18hp_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:gs1350-26hp_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:gs1915-8_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:gs1915-8ep_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:gs1915-24e_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:gs1915-24ep_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:gs1920-24v2_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:gs1920-48v2_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:gs1920-24hpv2_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:gs1920-48hpv2_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:gs2220-10_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:gs2220-28_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:gs2220-50_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:gs2220-10hp_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:gs2220-28hp_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:gs2220-50hp_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:xgs1930-28_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:xgs1930-28hp_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:xgs1930-52_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:xgs1930-52hp_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:xs1930-10_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:xs1930-12hp_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:xs1930-12f_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:xgs2210-28_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:xgs2210-52_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:xgs2210-28hp_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:xgs2210-52hp_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:xgs2220-30_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:xgs2220-30hp_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:xgs2220-30f_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:xgs2220-54_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:xgs2220-54hp_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:xgs2220-54fp_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:xgs4600-32_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:xgs4600-32f_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:xgs4600-52f_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:xmg1930-30_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:xmg1930-30hp_firmware:*:*:*:*:*:*:*:*

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