CVE-2019-5039: An exploitable command execution vulnerability exists in the ASN1 certificate writing functionality of Openwea

This month

HIGH 8.8DOWNGRADE

CVE-2019-5039 is a high-severity flaw (CVSS 8.8) affecting openweave-core. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An exploitable command execution vulnerability exists in the ASN1 certificate writing functionality of Openweave-core version 4.0.2. A specially crafted weave certificate can trigger a heap-based buffer overflow, resulting in code execution. An attacker can craft a weave certificate to trigger this vulnerability.

Why this priority

High severity
Public exploit reference

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

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.6% (top 24%)
CISA exploited list	No
Weakness	CWE-122, CWE-787
Published	2019-08-20
Last modified	2026-06-17

Publisher (CNA): Talos · Vendor: 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.

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-2019-5039?

openweave-core: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2019-5039 being exploited?

CVE-2019-5039 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-2019-5039 affect?

CVE-2019-5039 affects openweave-core. Severity is high (CVSS 8.8). An exploitable command execution vulnerability exists in the ASN1 certificate writing functionality of Openweave-core version 4.0.2. A specially crafted weave certificate can trigger a heap-based buffer overflow, resulting in code execution

How urgent is CVE-2019-5039?

Priority 55/100. High severity; Public exploit reference

Related CVEs

CVE-2019-5040 HIGH 7.5 DOWNGRADE MITIGATE An exploitable information disclosure vulnerability exists in the Weave MessageLayer parsing of Openweave-core
CVE-2019-5038 HIGH 8.8 DOWNGRADE An exploitable command execution vulnerability exists in the print-tlv command of Weave tool

References

← Back to latest CVEs