CVE-2020-35471
Envoy before 1.16.1 mishandles dropped and truncated datagrams, as demonstrated by a segmentation...
Envoy before 1.16.1 mishandles dropped and truncated datagrams, as demonstrated by a segmentation fault for a UDP packet size larger than 1500.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
Envoy before 1.16.1 mishandles dropped and truncated datagrams, as demonstrated by a segmentation fault for a UDP packet size larger than 1500.
- Record
CVE-2020-35471- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:N/I:N/A:P - Updated
- 2026-11-02
CVE List No score
Envoy before 1.16.1 mishandles dropped and truncated datagrams, as demonstrated by a segmentation fault for a UDP packet size larger than 1500.
- Record
CVE-2020-35471- Updated
- 2026-11-02
EUVDEUVD-2020-23143 No score
Envoy before 1.16.1 mishandles dropped and truncated datagrams, as demonstrated by a segmentation fault for a UDP packet size larger than 1500.
- Record
EUVD-2020-23143- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-vc66-g998-2h5p No score
Envoy before 1.16.1 mishandles dropped and truncated datagrams, as demonstrated by a segmentation...
Envoy before 1.16.1 mishandles dropped and truncated datagrams, as demonstrated by a segmentation fault for a UDP packet size larger than 1500.
- Record
GHSA-vc66-g998-2h5p- Updated
- 2026-11-02
OSV
Envoy before 1.16.1 mishandles dropped and truncated datagrams, as demonstrated by a segmentation fault for a UDP packet size larger than 1500.
- Record
CVE-2020-35471- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVBIT-envoy-2020-35471 No score
Envoy before 1.16.1 mishandles dropped and truncated datagrams, as demonstrated by a segmentation fault for a UDP packet size larger than 1500.
- Record
BIT-envoy-2020-35471- Updated
- 2026-11-02
OSVopenSUSE-SU-2022:0065-1 No score
Security update for envoy-proxy
This update for envoy-proxy fixes the following issues:
Update to 1.14.6:
- CVE-2020-35471: Fixed a denial of service via dropped and truncated UDP datagrams (boo#1180121).
- Record
openSUSE-SU-2022:0065-1- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
envoyBitnami |
before 1.16.1 | 1.16.1 |
envoy-proxySUSE:Package Hub 15 SP3 From an advisory covering 5 CVEs |
before 1.14.6-bp153.3.4.1 | 1.14.6-bp153.3.4.1 |
envoy-proxyopenSUSE:Leap 15.3 From an advisory covering 5 CVEs |
before 1.14.6-bp153.3.4.1 | 1.14.6-bp153.3.4.1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected, facts | ||
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2020-35471 is a high vulnerability (CVSS 7.5) in Envoyproxy Envoy, published December 15, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.39%, the 84th percentile. Fixed in envoy 1.16.1.
References
github.com/envoyproxy/envoy/compare/v1.16.0...v1.16.1
nvd.nist.gov/vuln/detail/CVE-2020-35471
lists.opensuse.org/archives/list/[email protected]/thread/WUFXLLYPEPLGLE3CNOENBUDET76YJXPI