CVE-2019-18838 Null dereference in n/a

What is CVE-2019-18838?

CVE-2019-18838 is a high-severity vulnerability in Envoyproxy Envoy, published on 13 Dec 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

An issue was discovered in Envoy 1.12.0. Upon receipt of a malformed HTTP request without a Host header, it sends an internally generated "Invalid request" response. This internally generated response is dispatched through the configured encoder filter chain before being sent to the client. An encoder filter that invokes route manager APIs that access a request's Host header causes a NULL pointer dereference, resulting in abnormal termination of the Envoy process.

Weakness: CWE-476

Which versions are affected by CVE-2019-18838?

It affects 1 product.

Products include Envoyproxy Envoy.

How do I fix CVE-2019-18838?

Upgrade to a fixed version.

Is CVE-2019-18838 being exploited?

There is no known exploitation of CVE-2019-18838 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-f2rv-4w6x-rwhc, GHSA-m3j5-qf4q-m73w.