Is CVE-2019-11840 in the CISA KEV catalog?

No. CVE-2019-11840 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2019-11840?

CVE-2019-11840 has a CVSS v3 base score of 5.9 (MEDIUM).

What is the EPSS score for CVE-2019-11840?

CVE-2019-11840 has an EPSS score of 3.44% (87th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2019-11840?

Upgrade golang-go.crypto on debian 11 to 1:0.0~git20200221.2aa609c-1 or later.

CVE & CISA-KEV Catalog

CVE-2019-11840

MEDIUMEPSS 87th pctl

5.9

CVSS v3

NVD

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.

CWE-330

How to fix

Remediation Available

golang-go.cryptoDebian

Fixed in:1:0.0~git20200221.2aa609c-1CVE-2019-11840

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Exploit Intelligence

3.44%probability of exploitation in 30 days

87thpercentile

Elevated risk: more likely to be exploited than 87% of all known CVEs.

References

Patch1

go.googlesource.com

Vendor Advisory1

bugzilla.redhat.com

Third-Party Advisory8

Other references1

groups.google.com

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-18.