CVE-2021-28683
envoyproxy/envoy: NULL pointer dereference in TLS alert code handling
Severity Score
7.5
*CVSS v3.1
Exploit Likelihood
*EPSS
Affected Versions
*CPE
Public Exploits
0
*Multiple Sources
Exploited in Wild
-
*KEV
Decision
-
*SSVC
Descriptions
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.
Se detectó un problema en Envoy versiones hasta 1.71.1. Se presenta una desreferencia de puntero NULL explotable remoto y bloqueo en TLS cuando es recibido un código de alerta TLS desconocido
A NULL pointer dereference vulnerability was found envoyproxy/envoy. This flaw allows an attacker to establish a TLS session that sends an invalid TLS alert code, causing a NULL pointer exception to occur that crashes the application, resulting in a denial of service. The highest threat from this vulnerability is to system availability.
*Credits:
N/A
CVSS Scores
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Attack Vector
Attack Complexity
Authentication
Confidentiality
Integrity
Availability
* Common Vulnerability Scoring System
SSVC
- Decision:-
Exploitation
Automatable
Tech. Impact
* Organization's Worst-case Scenario
Timeline
- 2021-03-18 CVE Reserved
- 2021-04-22 CVE Published
- 2024-02-03 EPSS Updated
- 2024-08-03 CVE Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
- CWE-476: NULL Pointer Dereference
CAPEC
References (6)
| URL | Tag | Source |
|---|---|---|
| https://github.com/envoyproxy/envoy/releases | Third Party Advisory | |
| https://github.com/envoyproxy/envoy/security/advisories/GHSA-r22g-5f3x-xjgg | Not Applicable | |
| https://github.com/envoyproxy/envoy/security/advisories/GHSA-xw4q-6pj2-5gfg | Third Party Advisory |
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|---|---|
| https://blog.envoyproxy.io | 2021-05-27 | |
| https://access.redhat.com/security/cve/CVE-2021-28683 | 2021-04-22 | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1942263 | 2021-04-22 |
Affected Vendors, Products, and Versions
| Vendor | Product | Version | Other | Status | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
| Envoyproxy Search vendor "Envoyproxy" | Envoy Search vendor "Envoyproxy" for product "Envoy" | 1.16.2 Search vendor "Envoyproxy" for product "Envoy" and version "1.16.2" | - |
Affected
| ||||||
| Envoyproxy Search vendor "Envoyproxy" | Envoy Search vendor "Envoyproxy" for product "Envoy" | 1.17.1 Search vendor "Envoyproxy" for product "Envoy" and version "1.17.1" | - |
Affected
| ||||||