How severe is CVE-2023-28770?

CVE-2023-28770 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2023-28770 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 58% (99th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-28770?

CVE-2023-28770 affects Zyxel Dx5401-b0 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-28770?

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-2023-28770 published?

CVE-2023-28770 was published on 2023-04-27 and last updated on 2026-06-17.

CVE-2023-28770

CVE-2023-28770 is a high-severity vulnerability in Zyxel Dx5401-b0 Firmware with a CVSS 3.x base score of 7.5. Its EPSS exploit-prediction score of 58% places it in the 99th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-200.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 58% (99th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-200
Affected product: Zyxel Dx5401-b0 Firmware
Published: 2023-04-27
Last modified: 2026-06-17

Description

The sensitive information exposure vulnerability in the CGI “Export_Log” and the binary “zcmd” in Zyxel DX5401-B0 firmware versions prior to V5.17(ABYO.1)C0 could allow a remote unauthenticated attacker to read the system files and to retrieve the password of the supervisor from the encrypted file.

Frequently asked questions

What is CVE-2023-28770?: The sensitive information exposure vulnerability in the CGI “Export_Log” and the binary “zcmd” in Zyxel DX5401-B0 firmware versions prior to V5.17(ABYO.1)C0 could allow a remote unauthenticated attacker to read the system files and to retrieve the password of the supervisor from the encrypted file.
How severe is CVE-2023-28770?: CVE-2023-28770 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2023-28770 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 58% (99th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-28770?: CVE-2023-28770 affects Zyxel Dx5401-b0 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-28770?: 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-2023-28770 published?: CVE-2023-28770 was published on 2023-04-27 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:zyxel:dx5401-b0_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Zyxel Dx5401-b0 Firmware

CVE-2023-28769 — Critical (CVSS 9.8): The buffer overflow vulnerability in the library “libclinkc.so” of the web server “zhttpd” in Zyxel DX5401-B0…
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CVE-2022-26413 — High (CVSS 8.0): A command injection vulnerability in the CGI program of Zyxel VMG3312-T20A firmware version 5.30(ABFX.5)C0 could allow…
CVE-2024-8748 — High (CVSS 7.5): A buffer overflow vulnerability in the packet parser of the third-party library "libclinkc" in Zyxel VMG8825-T50K…
CVE-2024-5412 — High (CVSS 7.5): A buffer overflow vulnerability in the library "libclinkc" of the Zyxel VMG8825-T50K firmware version 5.50(ABOM.8)C0…
CVE-2024-12010 — High (CVSS 7.2): A post-authentication command injection vulnerability in the ”zyUtilMailSend” function of the Zyxel AX7501-B1…

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