CVE-2019-18836 Denial of service in n/a

What is CVE-2019-18836?

CVE-2019-18836 is a high-severity denial of service vulnerability in Envoyproxy Envoy, published on 11 Nov 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Envoy 1.12.0 allows a remote denial of service because of resource loops, as demonstrated by a single idle TCP connection being able to keep a worker thread in an infinite busy loop when continue_on_listener_filters_timeout is used."

Weakness: CWE-835

Which versions are affected by CVE-2019-18836?

It affects 2 products.

Products include Envoyproxy Envoy, Istio Istio.

How do I fix CVE-2019-18836?

No fix has been published for CVE-2019-18836 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2019-18836 being exploited?

There is no known exploitation of CVE-2019-18836 in the wild and no public exploit code.

Other vulnerabilities in Envoyproxy Envoy

• CVE-2022-29226 Trivial authentication bypass in Envoy Critical 10.0
• CVE-2019-18801 Memory corruption in n/a Critical 9.8
• CVE-2019-18802 Security feature bypass in n/a Critical 9.8
• CVE-2020-35470 Information disclosure in n/a High 8.8
• CVE-2024-23324 Envoy ext auth can be bypassed when Proxy protocol filter sets invalid UTF-8 metadata High 8.6

All Envoyproxy Envoy vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• GitHub advisory
• How this page is made

Also known as GHSA-3xvf-4396-cj46, GHSA-4r53-8549-7m3r.