CVSS 3.1
7.5 highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HCVE-2021-28484
High (7.5). EPSS 1.5% chance of exploitation in the next 30 days. Fixed in github.com/Yubico/yubihsm-connector 3.0.1.
An issue was discovered in the /api/connector endpoint handler in Yubico yubihsm-connector before 3.0.1 (in YubiHSM SDK before 2021.04). The handler did not validate the length of the request, which can lead to a state where yubihsm-connector becomes stuck in a loop waiting for the YubiHSM to send it data, preventing any further operations until the yubihsm-connector is restarted. An attacker can send 0, 1, or 2 bytes to trigger this.
Severity
- EPSS
- 1.5% chance of exploitation in the next 30 days; higher than 74% of CVEs (scores of 2026-10-31)
- CWE
- CWE-835
- Published
- Modified
- Record from
- the NVD, synced
Affected
- fedoraproject:fedora
- yubico:yubihsm_connector
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-8m9g-647g-5pxw | Go | github.com/Yubico/yubihsm-connector | <3.0.1 | 3.0.1 |
References
- https://github.com/Yubico/yubihsm-connector/releases
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/B7Q2KGXSPQEEONAWMFZRVH2TXWX3QPCQ/
- https://www.yubico.com/support/security-advisories/ysa-2021-02/
- https://github.com/Yubico/yubihsm-connector/releases
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/B7Q2KGXSPQEEONAWMFZRVH2TXWX3QPCQ/