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CVE-2019-11840

Published: May 9, 2019Updated: May 18, 2026 Sources: CVE List NVD GHSACWE-330
NVD MITRE
5.9CVSSMEDIUM
EPSS Score
3.4%
Top 12.6%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:HPR:NUI:NS:UC:HI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-330

Affected Products

n/an/a
golang.org/x/cryptoGoOSS Libraries
cryptogolangOSS Libraries
debian linuxdebian
On-premOS
Operating Systems / linux-distro
gopackage-ecosystemOSS Libraries
golangoss-projectUSOSS Libraries
debianoss-projectGBOperating Systemsaka debian gnu/linux

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Credential Access
View detailed technique mapping

References

https://groups.google.com/forum/#%21msg/golang-announce/tjyNcJxb2vQ/n0NRBziSCAAJ
groups.google.com
https://bugzilla.redhat.com/show_bug.cgi?id=1691529
bugzilla.redhat.com
https://go.googlesource.com/crypto/+/b7391e95e576cacdcdd422573063bc057239113d
go.googlesource.com
and 14 more references View all →

Timeline

Published
May 9, 2019
Last Updated
May 18, 2026

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