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No exploitation reportedFix available

CVE-2020-35471

No exploitation reported by the sources we read.

  • Published2020-12-15
  • Fixed in1.16.1

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2020-12-1501:15CVE publishedNVD

Versions per branch

NVD · OSV
Envoy
BranchAffectedFixed in
1.16< 1.16.11.16.1

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • envoy-proxySUSE:Package Hub 15 SP3all versions · fixed in 1.14.6-bp153.3.4.1
  • envoy-proxyopenSUSE:Leap 15.3all versions · fixed in 1.14.6-bp153.3.4.1

Vendor advisories

  • CVE-2020-35471 Red Hat Product Security4 known affected

    envoy: mishandling dropped and truncated datagrams leads to segfault and DoS

    servicemesh-proxy as a component of OpenShift Service Mesh 1 · servicemesh-proxy.src as a component of OpenShift Service Mesh 1 · servicemesh-proxy as a component of OpenShift Service Mesh 2.0 · +1 more

Full record on NVD

Fix

  1. Update Envoy to 1.16.1
  2. No fix planned, says the vendor Red Hat Product Security CVE-2020-35471 · 4 productsWill not fix

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2020-12-15
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-vc66-g998-2h5p

Frequently asked questions

What is CVE-2020-35471?

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

Is CVE-2020-35471 actively exploited?

Active exploitation of CVE-2020-35471 has not been confirmed. Its EPSS score was 2.4% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-35471?

CVE-2020-35471 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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Sources for this record