5.6
MEDIUM
CVE-2021-3499
OVN Kubernetes DNS Egress Firewall Reliability Weakness
Description

A vulnerability was found in OVN Kubernetes in versions up to and including 0.3.0 where the Egress Firewall does not reliably apply firewall rules when there is multiple DNS rules. It could lead to potentially lose of confidentiality, integrity or availability of a service.

INFO

Published Date :

June 2, 2021, 4:15 p.m.

Last Modified :

Nov. 21, 2024, 6:21 a.m.

Remotely Exploitable :

Yes !

Impact Score :

3.4

Exploitability Score :

2.2
Affected Products

The following products are affected by CVE-2021-3499 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Ovn ovn-kubernetes
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2021-3499.

URL Resource
https://bugzilla.redhat.com/show_bug.cgi?id=1949188 Issue Tracking Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1949188 Issue Tracking Third Party Advisory

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2021-3499 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2021-3499 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by af854a3a-2127-422b-91ae-364da2661108

    Nov. 21, 2024

    Action Type Old Value New Value
    Added Reference https://bugzilla.redhat.com/show_bug.cgi?id=1949188
  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • CVE Modified by [email protected]

    Feb. 12, 2023

    Action Type Old Value New Value
    Changed Description A vulnerability was found in OVN Kubernetes where the Egress Firewall does not reliably apply firewall rules when there is multiple dns rules. It could lead to potentially lose of confidentiality, integrity or availability of a service. A vulnerability was found in OVN Kubernetes in versions up to and including 0.3.0 where the Egress Firewall does not reliably apply firewall rules when there is multiple DNS rules. It could lead to potentially lose of confidentiality, integrity or availability of a service.
    Removed CVSS V3.1 Red Hat, Inc. AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
    Removed Reference https://access.redhat.com/errata/RHBA-2021:1550 [No Types Assigned]
    Removed Reference https://access.redhat.com/security/cve/CVE-2021-3499 [No Types Assigned]
    Added CWE Red Hat, Inc. CWE-863
  • CVE Modified by [email protected]

    Feb. 02, 2023

    Action Type Old Value New Value
    Changed Description A vulnerability was found in OVN Kubernetes in versions up to and including 0.3.0 where the Egress Firewall does not reliably apply firewall rules when there is multiple DNS rules. It could lead to potentially lose of confidentiality, integrity or availability of a service. A vulnerability was found in OVN Kubernetes where the Egress Firewall does not reliably apply firewall rules when there is multiple dns rules. It could lead to potentially lose of confidentiality, integrity or availability of a service.
    Added CVSS V3.1 Red Hat, Inc. AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
    Added Reference https://access.redhat.com/errata/RHBA-2021:1550 [No Types Assigned]
    Added Reference https://access.redhat.com/security/cve/CVE-2021-3499 [No Types Assigned]
    Removed CWE Red Hat, Inc. CWE-863
  • Reanalysis by [email protected]

    Oct. 27, 2022

    Action Type Old Value New Value
    Added CWE NIST CWE-863
  • Reanalysis by [email protected]

    Jun. 15, 2021

    Action Type Old Value New Value
    Removed CVSS V2 NIST (AV:N/AC:L/Au:N/C:P/I:P/A:P)
    Added CVSS V2 NIST (AV:N/AC:M/Au:N/C:P/I:P/A:P)
    Removed CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    Added CVSS V3.1 NIST AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
  • Initial Analysis by [email protected]

    Jun. 14, 2021

    Action Type Old Value New Value
    Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:P/I:P/A:P)
    Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    Changed Reference Type https://bugzilla.redhat.com/show_bug.cgi?id=1949188 No Types Assigned https://bugzilla.redhat.com/show_bug.cgi?id=1949188 Issue Tracking, Third Party Advisory
    Added CPE Configuration OR *cpe:2.3:a:ovn:ovn-kubernetes:*:*:*:*:*:*:*:* versions up to (including) 0.3.0
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2021-3499 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2021-3499 weaknesses.

Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.09 }} 0.00%

score

0.40888

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability