8.6
HIGH
CVE-2021-39206
Pomerium Envoy Authorization Routing Vulnerability
Description

Pomerium is an open source identity-aware access proxy. Envoy, which Pomerium is based on, contains two authorization related vulnerabilities CVE-2021-32777 and CVE-2021-32779. This may lead to incorrect routing or authorization policy decisions. With specially crafted requests, incorrect authorization or routing decisions may be made by Pomerium. Pomerium v0.14.8 and v0.15.1 contain an upgraded envoy binary with these vulnerabilities patched. This issue can only be triggered when using path prefix based policy. Removing any such policies should provide mitigation.

INFO

Published Date :

Sept. 9, 2021, 11:15 p.m.

Last Modified :

Sept. 27, 2021, 6:30 p.m.

Remotely Exploitable :

Yes !

Impact Score :

4.0

Exploitability Score :

3.9
Affected Products

The following products are affected by CVE-2021-39206 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 Envoyproxy envoy
1 Pomerium pomerium
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-2021-39206.

URL Resource
https://github.com/envoyproxy/envoy/security/advisories/GHSA-6g4j-5vrw-2m8h Third Party Advisory
https://github.com/envoyproxy/envoy/security/advisories/GHSA-r222-74fw-jqr9 Third Party Advisory
https://github.com/pomerium/pomerium/security/advisories/GHSA-cfc2-wjcm-c8fm Third Party Advisory
https://groups.google.com/g/envoy-announce/c/5xBpsEZZDfE/m/wD05NZBbAgAJ Not Applicable

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-2021-39206 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2021-39206 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 [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • Initial Analysis by [email protected]

    Sep. 27, 2021

    Action Type Old Value New Value
    Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:N/I:P/A:N)
    Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
    Changed Reference Type https://github.com/envoyproxy/envoy/security/advisories/GHSA-6g4j-5vrw-2m8h No Types Assigned https://github.com/envoyproxy/envoy/security/advisories/GHSA-6g4j-5vrw-2m8h Third Party Advisory
    Changed Reference Type https://github.com/envoyproxy/envoy/security/advisories/GHSA-r222-74fw-jqr9 No Types Assigned https://github.com/envoyproxy/envoy/security/advisories/GHSA-r222-74fw-jqr9 Third Party Advisory
    Changed Reference Type https://github.com/pomerium/pomerium/security/advisories/GHSA-cfc2-wjcm-c8fm No Types Assigned https://github.com/pomerium/pomerium/security/advisories/GHSA-cfc2-wjcm-c8fm Third Party Advisory
    Changed Reference Type https://groups.google.com/g/envoy-announce/c/5xBpsEZZDfE/m/wD05NZBbAgAJ No Types Assigned https://groups.google.com/g/envoy-announce/c/5xBpsEZZDfE/m/wD05NZBbAgAJ Not Applicable
    Added CPE Configuration OR *cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:* versions up to (excluding) 1.16.5 *cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:* versions from (including) 1.17.0 up to (excluding) 1.17.4 *cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:* versions from (including) 1.18.0 up to (excluding) 1.18.4 *cpe:2.3:a:envoyproxy:envoy:1.19.0:*:*:*:*:*:*:* *cpe:2.3:a:pomerium:pomerium:*:*:*:*:*:*:*:* versions from (including) 0.11.0 up to (excluding) 0.14.8 *cpe:2.3:a:pomerium:pomerium:0.15.0:*:*:*:*:*:*:*
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-2021-39206 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-2021-39206 weaknesses.

Exploit Prediction

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

0.20 }} 0.02%

score

0.57298

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
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