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Envoy CVE-2021-28683

HIGH
NULL Pointer Dereference (CWE-476)
2021-05-20 cve@mitre.org
Null Pointer Dereference Denial Of Service Envoy
7.5
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

1
CVE Published
May 20, 2021 - 17:15 nvd
HIGH 7.5

DescriptionNVD

An issue was discovered in Envoy through 1.71.1. There is a remotely exploitable NULL pointer dereference and crash in TLS when an unknown TLS alert code is received.

AnalysisAI

An issue was discovered in Envoy through 1.71.1. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Technical ContextAI

This vulnerability is classified as NULL Pointer Dereference (CWE-476), which allows attackers to crash the application by dereferencing a null pointer. An issue was discovered in Envoy through 1.71.1. There is a remotely exploitable NULL pointer dereference and crash in TLS when an unknown TLS alert code is received. Affected products include: Envoyproxy Envoy. Version information: through 1.71.1..

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Check pointers before dereferencing. Use static analysis tools to detect null pointer paths.

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Same weakness CWE-476 – NULL Pointer Dereference

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Same technique Null Pointer Dereference

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CVE-2016-0742 HIGH
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CVE-2014-3470 MEDIUM
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CVE-2017-3730 HIGH POC
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CVE-2016-4957 HIGH
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CVE-2015-3194 HIGH
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CVE-2017-0016 MEDIUM
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CVE-2021-28683 vulnerability details – vuln.today
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