---
cve: "CVE-2016-9243"
severity: "LOW"
cvss: 3.1
epss: "3.4%"
vendor: "n/a"
kev: false
exploited: false
published: "2017-03-27 17:59:00"
tags: [cve, security, low]
source: tsecurity.de CVE-Dossier
exported: "2026-09-13T16:55:51+02:00"
---

# CVE-2016-9243

> 3.1 LOW · 🧪 PoC

## Beschreibung

HKDF in cryptography before 1.5.2 returns an empty byte-string if used with a length less than algorithm.digest_size.

## Patch verfügbar (OSV)

- b924696b2e8731f39696584d12cceeb3aeb2d874 (Commit)

## Referenzen

- <https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/U23KDR2M2N7W2ZSREG63BVW7D4VC6CIZ/>
- <http://www.ubuntu.com/usn/USN-3138-1>
- <https://github.com/pyca/cryptography/commit/b924696b2e8731f39696584d12cceeb3aeb2d874>
- <https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WQ5G7KHKZC4SI23JE7277KZXM57GEQKT/>
- <http://www.securityfocus.com/bid/94216>
- <http://www.openwall.com/lists/oss-security/2016/11/09/2>
- <https://cryptography.io/en/latest/changelog>
- <https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5R2ZOBMPWDFFHUZ6QOZZY36A6H5CGJXL/>
- <https://github.com/pyca/cryptography/issues/3211>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2016-9243) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_