CVE-2020-35471 Denial of service in n/a

What is CVE-2020-35471?

CVE-2020-35471 is a high-severity denial of service vulnerability in Envoyproxy Envoy, published on 15 Dec 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Envoy before 1.16.1 mishandles dropped and truncated datagrams, as demonstrated by a segmentation fault for a UDP packet size larger than 1500.

Which versions are affected by CVE-2020-35471?

1 open source package ship an affected version, including envoy. It affects 1 product.

Products include Envoyproxy Envoy.

How do I fix CVE-2020-35471?

Upgrade envoy to 1.16.1 or later.

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-2020-35471 being exploited?

There is no known exploitation of CVE-2020-35471 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
• How this page is made

Also known as BIT-envoy-2020-35471, GHSA-vc66-g998-2h5p.