What’s Vulnerable › Vulnerabilities

CVE-2022-4980: General Bytes Crypto Application Server (CAS) Unauthenticated Creation of Admin Account via Default-installation/First-admin Page

• Severity: critical (CVSS 9.3 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-09-19 · updated 2026-06-17
• Weakness: CWE-306

Description

General Bytes Crypto Application Server (CAS) beginning with version 20201208 prior to 20220531.38 (backport) and 20220725.22 (mainline) contains an authentication bypass in the admin web interface. An unauthenticated attacker could invoke the same URL used by the product's default-installation / first-admin creation page and create a new administrative account remotely. By gaining admin privileges, the attacker can change the ATM configuration resulting in redirected funds. Public vendor advisories and multiple independent writeups describe the vulnerability as a call to the page used for initial/default installation / first administration user creation; General Bytes has not publicly published the exact endpoint/parameter name. The issue was actively exploited in the wild against cloud-hosted and standalone CAS deployments (scanning exposed CAS instances on ports 7777/443), and publicly acknowledged by the General Bytes in September 2022.

Affected products

• General Bytes Crypto Application Server (CAS): from 20201208 before 20220725.22; from 20201208 before 20220531.38 — fixed in 20220531.38, 20220725.22

How to fix

Upgrade to a fixed version: General Bytes Crypto Application Server (CAS) 20220531.38, 20220725.22. Check the vendor advisory for mitigations.

References

• https://generalbytes.atlassian.net/wiki/spaces/ESD/pages/2785509377/Security%2BIncident%2B
• https://news.sophos.com/en-us/2022/08/23/bitcoin-atms-leeched-by-attackers-who-created-fake-admin-accounts/
• https://thehackernews.com/2022/08/hackers-stole-crypto-from-bitcoin-atms.html
• https://www.halborn.com/blog/post/explained-the-general-bytes-bitcoin-atm-hack-august-2022
• https://www.incibe.es/en/incibe-cert/publications/cybersecurity-highlights/0day-vulnerability-exploited-general-bytes
• https://www.vulncheck.com/advisories/general-bytes-cas-unauth-creation-of-admin-account-via-default-installation-first-admin-page

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