CVE-2019-11840

MEDIUM
5.9
CVSS Score
Published: May 9, 2019 at 12:00 AM UTC
Updated: June 17, 2026 at 02:13 AM UTC
2 products affected across 2 vendorsDebian LinuxCrypto

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Severity
MEDIUM5.9
Exploit prediction
EPSS 3%

Description

An issue was discovered in the supplementary Go cryptography library, golang.org/x/crypto, before v0.0.0-20190320223903-b7391e95e576. A flaw was found in the amd64 implementation of the golang.org/x/crypto/salsa20 and golang.org/x/crypto/salsa20/salsa packages. If more than 256 GiB of keystream is generated, or if the counter otherwise grows greater than 32 bits, the amd64 implementation will first generate incorrect output, and then cycle back to previously generated keystream. Repeated keystream bytes can lead to loss of confidentiality in encryption applications, or to predictability in CSPRNG applications.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

All versions
Affected range stops below 2019-03-20, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

CVSS

Attack Vector
NETWORK
Complexity
HIGH
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-330

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