CVE-2019-5040: An exploitable information disclosure vulnerability exists in the Weave MessageLayer parsing of Openweave-core

This week

HIGH 7.5REMOTEDOWNGRADEMITIGATE

CVE-2019-5040 is a high-severity flaw (CVSS 7.5) affecting openweave-core, nest cam iq indoor firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An exploitable information disclosure vulnerability exists in the Weave MessageLayer parsing of Openweave-core version 4.0.2 and Nest Cam IQ Indoor version 4620002. A specially crafted weave packet can cause an integer overflow to occur, resulting in PacketBuffer data reuse. An attacker can send a packet to trigger this vulnerability.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.8% (top 44%)
CISA exploited list	No
Weakness	CWE-190
Published	2019-08-20
Last modified	2026-06-17

Publisher (CNA): Talos · Vendor: google · openweave

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2019-08-20 21:15 UTCPublished CVE record published
2026-06-17 02:37 UTCUpdated Record last modified

openweave openweave-core DOWNGRADE

Affected: 4.0.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.0.2

1. Check installed version

apt-cache policy openweave-core || rpm -q openweave-core || openweave-core --version

2. No fixed release: DOWNGRADE to a release before 4.0.2 (Debian / Ubuntu)

apt-cache madison openweave-core sudo apt install openweave-core=<VERSION_BEFORE_4.0.2> sudo apt-mark hold openweave-core

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list openweave-core sudo dnf downgrade openweave-core-<VERSION_BEFORE_4.0.2> sudo dnf versionlock add openweave-core

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

google nest cam iq indoor firmware MITIGATE

Affected: 4620002

Fixed in: no fixed release known

Safe to downgrade to: a release before 4620002

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2019-5040?

openweave-core: downgrade or apply the listed mitigation; nest cam iq indoor firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2019-5040 being exploited?

CVE-2019-5040 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2019-5040 affect?

CVE-2019-5040 affects openweave-core, nest cam iq indoor firmware. Severity is high (CVSS 7.5). An exploitable information disclosure vulnerability exists in the Weave MessageLayer parsing of Openweave-core version 4.0.2 and Nest Cam IQ Indoor version 4620002. A specially crafted weave packet can cause an integer overflow to occur, re

How urgent is CVE-2019-5040?

Priority 50/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2019-5039 HIGH 8.8 DOWNGRADE An exploitable command execution vulnerability exists in the ASN1 certificate writing functionality of Openwea
CVE-2019-5038 HIGH 8.8 DOWNGRADE An exploitable command execution vulnerability exists in the print-tlv command of Weave tool

References

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