How severe is CVE-2023-22918?

CVE-2023-22918 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2023-22918 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (51st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-22918?

CVE-2023-22918 primarily affects Zyxel Atp200 Firmware. In total, 51 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2023-22918?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2023-22918 published?

CVE-2023-22918 was published on 2023-04-24 and last updated on 2026-06-17.

CVE-2023-22918

CVE-2023-22918 is a medium-severity vulnerability in Zyxel Atp200 Firmware with a CVSS 3.x base score of 6.5. 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-359.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 1% (51st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-359
Affected product: Zyxel Atp200 Firmware
Published: 2023-04-24
Last modified: 2026-06-17

Description

A post-authentication information exposure vulnerability in the CGI program of Zyxel ATP series firmware versions 4.32 through 5.35, USG FLEX series firmware versions 4.50 through 5.35, USG FLEX 50(W) firmware versions 4.16 through 5.35, USG20(W)-VPN firmware versions 4.16 through 5.35, VPN series firmware versions 4.30 through 5.35, NWA110AX firmware version 6.50(ABTG.2) and earlier versions, WAC500 firmware version 6.50(ABVS.0) and earlier versions, and WAX510D firmware version 6.50(ABTF.2) and earlier versions, which could allow a remote authenticated attacker to retrieve encrypted information of the administrator on an affected device.

Frequently asked questions

What is CVE-2023-22918?: A post-authentication information exposure vulnerability in the CGI program of Zyxel ATP series firmware versions 4.32 through 5.35, USG FLEX series firmware versions 4.50 through 5.35, USG FLEX 50(W) firmware versions 4.16 through 5.35, USG20(W)-VPN firmware versions 4.16 through 5.35, VPN series firmware versions 4.30 through 5.35, NWA110AX firmware version 6.50(ABTG.2) and earlier versions, WAC500 firmware version 6.50(ABVS.0) and earlier versions, and WAX510D firmware version 6.50(ABTF.2) and earlier versions, which could allow a remote authenticated attacker to retrieve encrypted information of the administrator on an affected device.
How severe is CVE-2023-22918?: CVE-2023-22918 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2023-22918 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (51st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-22918?: CVE-2023-22918 primarily affects Zyxel Atp200 Firmware. In total, 51 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2023-22918?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2023-22918 published?: CVE-2023-22918 was published on 2023-04-24 and last updated on 2026-06-17.

References

https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-of-firewalls-and-aps

Affected products (51)

cpe:2.3:o:zyxel:atp200_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:atp100_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:atp700_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:atp500_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:atp100w_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:atp800_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:usg_flex_100_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:usg_flex_50_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:usg_flex_200_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:usg_flex_500_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:usg_flex_700_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:usg_flex_100w_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:usg_20w-vpn_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:usg_flex_50w_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:usg20-vpn_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vpn100_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vpn1000_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vpn300_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vpn50_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:nap203_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:nap303_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:nap353_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:nwa110ax_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:nwa1123-ac_hd_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:nwa1123-ac-pro_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:nwa1123acv3_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:nwa210ax_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:nwa220ax-6e_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:nwa50ax_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:nwa50ax-pro_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:nwa5123-ac_hd_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:nwa55axe_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:nwa90ax_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:nwa90ax-pro_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:wac500_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:wac500h_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:wac5302d-sv2_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:wac6103d-i_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:wac6303d-s_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:wac6502d-e_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Zyxel Atp200 Firmware

CVE-2023-33010 — Critical (CVSS 9.8): A buffer overflow vulnerability in the ID processing function in Zyxel ATP series firmware versions 4.32 through 5.36…
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CVE-2022-30525 — Critical (CVSS 9.8): A OS command injection vulnerability in the CGI program of Zyxel USG FLEX 100(W) firmware versions 5.00 through 5.21…
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