Vulnerability in Zyxel Gs1900-10hp
CVE-2019-15802
An issue was discovered on Zyxel GS1900 devices with firmware before 2.50(AAHH.0)C0. The firmware hashes and encrypts passwords using a hardcoded cryptographic key in sal_util_str_encrypt() in libsal.so.0.0. The parameters (salt, IV, and key data) are used to encrypt and decrypt all passwords using AES256 in CBC mode. With the parameters known, all previously encrypted passwords can be decrypted. This includes the passwords that are part of configuration backups or otherwise embedded as part of the firmware.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.015 (74.1th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 74th percentile — 74.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.015 · newest: 0.015 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- jasper.la/exploring-zyxel-gs1900-firmware-with-ghidra.html (Exploit, Third Party Advisory)
- www.zyxel.com/support/gs1900-switch-vulnerabilities.shtml (Vendor Advisory)
Frequently asked questions
- What is CVE-2019-15802?
- CVE-2019-15802 is a medium-severity vulnerability in Zyxel Gs1900-10hp, classified under Use of Hard-coded Credentials. CVSS score: 5.9/10. Published 2019-11-14.
- How severe is CVE-2019-15802?
- Medium severity. CVSS v3 base score is 5.9 out of 10.
- Is CVE-2019-15802 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.