CVE-2016-9243
HIGH
7.5
CVSS Score
Published: March 27, 2017 at 05:00 PM UTC
Updated: June 17, 2026 at 12:55 AM UTC
3 products affected across 3 vendorsFedoraUbuntu LinuxCryptography
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Severity
HIGH7.5
Exploit prediction
EPSS 3%
Description
HKDF in cryptography before 1.5.2 returns an empty byte-string if used with a length less than algorithm.digest_size.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
Ubuntu Linux· Canonicalrubygems
95%v ≤ 1.5.2
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
- http://www.openwall.com/lists/oss-security/2016/11/09/2
- 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/5R2ZOBMPWDFFHUZ6QOZZY36A6H5CGJXL/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/U23KDR2M2N7W2ZSREG63BVW7D4VC6CIZ/
References (9)
Mailing Listx_refsource_MLISTPatchVDB Entry
Source: [email protected]
http://www.openwall.com/lists/oss-security/2016/11/09/2VDB Entryx_refsource_BIDBroken LinkThird Party Advisory
Source: [email protected]
http://www.securityfocus.com/bid/94216Vendor Advisoryx_refsource_UBUNTUThird Party Advisory
Source: [email protected]
http://www.ubuntu.com/usn/USN-3138-1x_refsource_CONFIRMRelease NotesThird Party Advisory
Source: [email protected]
https://cryptography.io/en/latest/changelogx_refsource_CONFIRMPatchThird Party Advisory
Source: [email protected]
https://github.com/pyca/cryptography/commit/b924696b2e8731f39696584d12cceeb3aeb2d874x_refsource_CONFIRMIssue TrackingThird Party Advisory
Source: [email protected]
https://github.com/pyca/cryptography/issues/3211Vendor Advisoryx_refsource_FEDORAMailing ListThird Party Advisory
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5R2ZOBMPWDFFHUZ6QOZZY36A6H5CGJXL/Vendor Advisoryx_refsource_FEDORAMailing ListThird Party Advisory
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/U23KDR2M2N7W2ZSREG63BVW7D4VC6CIZ/CVSS
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- NONE
- Integrity
- HIGH
- Availability
- NONE
Vector?
Quick Info
StatusMODIFIED
CWE
NVD-CWE-noinfo
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