CVE-2023-28770
HighExploitedPublic exploitThe 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…
Published Apr 27, 2023 · Updated Jan 31, 2025
Key Facts
Patch immediately- CVE-2023-28770 is a high-severity vulnerability (CVSS 7.5 v3.1) affecting DX5401-B0 firmware (Zyxel).
- It is exploited in the wild, listed in Industry KEV feed, CIRCL KEV since Apr 27, 2023. Public exploit code is available.
- EPSS estimates a 58% probability of exploitation in the next 30 days.
- Fixed versions are available, including DX5401-B0 firmware 5.17\(abyo.1\)c0.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
EPSS (30-day exploit likelihood)
58%
Higher than 99.0% of all scored CVEs
Exploited in the wild
Yes
2 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2023-28770 brief as a PDF
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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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| Industry KEV feed | Nov 28, 2023 | n/a | Not reported |
| CIRCL KEV | Apr 27, 2023 | n/a | Not reported |
Required action: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
Affected Products
2 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| DX5401-B0 firmwareZyxel | >= < V5.17(ABYO.1)C0 | 5.17\(abyo.1\)c0 |
Patched Releases
DX5401-B0 firmware
5.17\(abyo.1\)c0
Timeline
Publicly disclosed
Apr 27, 2023
Added to CIRCL KEV
Apr 27, 2023
Added to Industry KEV feed
Nov 28, 2023
Last updated
Jan 31, 2025
Weakness Type
- CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
- CWE-203 Observable Discrepancy
References
- advisoryhttps://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
FAQ
Common Questions.
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.
Affected: DX5401-B0 firmware (Zyxel) versions >= < V5.17(ABYO.1)C0. The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed, CIRCL KEV since Apr 27, 2023.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including DX5401-B0 firmware 5.17\(abyo.1\)c0.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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