Search for vulnerabilities
Vulnerability details: VCID-dp7a-3quf-aaac
Vulnerability ID VCID-dp7a-3quf-aaac
Aliases CVE-2021-28683
Summary 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.
Status Published
Exploitability 0.5
Weighted Severity 9.0
Risk 4.5
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-476 NULL Pointer Dereference
System Score Found at
rhas Important https://access.redhat.com/errata/RHSA-2021:1322
rhas Important https://access.redhat.com/errata/RHSA-2021:1324
cvssv3 7.5 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-28683.json
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00116 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00170 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00170 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00170 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00170 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00170 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00170 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00170 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00170 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00170 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00170 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00170 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00170 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00170 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00170 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00170 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00170 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
epss 0.00184 https://api.first.org/data/v1/epss?cve=CVE-2021-28683
rhbs high https://bugzilla.redhat.com/show_bug.cgi?id=1942263
cvssv2 5.0 https://nvd.nist.gov/vuln/detail/CVE-2021-28683
cvssv3 7.5 https://nvd.nist.gov/vuln/detail/CVE-2021-28683
cvssv3.1 7.5 https://nvd.nist.gov/vuln/detail/CVE-2021-28683
archlinux Critical https://security.archlinux.org/AVG-1947
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-28683.json
https://api.first.org/data/v1/epss?cve=CVE-2021-28683
https://blog.envoyproxy.io
https://github.com/envoyproxy/envoy/releases
https://github.com/envoyproxy/envoy/security/advisories/GHSA-r22g-5f3x-xjgg
https://github.com/envoyproxy/envoy/security/advisories/GHSA-xw4q-6pj2-5gfg
1942263 https://bugzilla.redhat.com/show_bug.cgi?id=1942263
AVG-1947 https://security.archlinux.org/AVG-1947
cpe:2.3:a:envoyproxy:envoy:1.16.2:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:envoyproxy:envoy:1.16.2:*:*:*:*:*:*:*
cpe:2.3:a:envoyproxy:envoy:1.17.1:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:envoyproxy:envoy:1.17.1:*:*:*:*:*:*:*
CVE-2021-28683 https://nvd.nist.gov/vuln/detail/CVE-2021-28683
ISTIO-SECURITY-2021-003 https://istio.io/latest/news/security/ISTIO-SECURITY-2021-003/
RHSA-2021:1322 https://access.redhat.com/errata/RHSA-2021:1322
RHSA-2021:1324 https://access.redhat.com/errata/RHSA-2021:1324
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-28683.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2021-28683
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2021-28683
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2021-28683
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.27199
EPSS Score 0.00116
Published At March 28, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
There are no relevant records.