7.5
HIGH
CVE-2021-20275
Privoxy Denial of Service Vulnerability
Description

A flaw was found in privoxy before 3.0.32. A invalid read of size two may occur in chunked_body_is_complete() leading to denial of service.

INFO

Published Date :

March 9, 2021, 2:15 p.m.

Last Modified :

Aug. 5, 2022, 6:06 p.m.

Source :

[email protected]

Remotely Exploitable :

Yes !

Impact Score :

3.6

Exploitability Score :

3.9
Public PoC/Exploit Available at Github

CVE-2021-20275 has a 1 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

Affected Products

The following products are affected by CVE-2021-20275 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 Debian debian_linux
1 Privoxy privoxy
: Total Affected Vendor : 2 | Products : 2
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-2021-20275.

URL Resource
https://bugzilla.redhat.com/show_bug.cgi?id=1936666 Issue Tracking Patch Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/03/msg00009.html Third Party Advisory
https://security.gentoo.org/glsa/202107-16 Third Party Advisory
https://www.privoxy.org/announce.txt Release Notes Vendor 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).

Profile Photo
MegaManSec/privoxy

A heavily edited version of Privoxy intended for fuzzing.

Updated: 1 month, 3 weeks ago
0 stars 0 fork 0 watcher
Born at : May 1, 2021, 11:58 p.m. This repo has been linked 9 different CVEs too.

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

The following list is the news that have been mention CVE-2021-20275 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2021-20275 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
  • Reanalysis by [email protected]

    Aug. 05, 2022

    Action Type Old Value New Value
    Added CWE NIST CWE-125
  • Modified Analysis by [email protected]

    Dec. 14, 2021

    Action Type Old Value New Value
    Changed Reference Type https://security.gentoo.org/glsa/202107-16 No Types Assigned https://security.gentoo.org/glsa/202107-16 Third Party Advisory
  • CVE Modified by [email protected]

    Jul. 08, 2021

    Action Type Old Value New Value
    Added Reference https://security.gentoo.org/glsa/202107-16 [No Types Assigned]
  • Initial Analysis by [email protected]

    Mar. 10, 2021

    Action Type Old Value New Value
    Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:N/I:N/A:P)
    Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    Changed Reference Type https://bugzilla.redhat.com/show_bug.cgi?id=1936666 No Types Assigned https://bugzilla.redhat.com/show_bug.cgi?id=1936666 Issue Tracking, Patch, Third Party Advisory
    Changed Reference Type https://lists.debian.org/debian-lts-announce/2021/03/msg00009.html No Types Assigned https://lists.debian.org/debian-lts-announce/2021/03/msg00009.html Third Party Advisory
    Changed Reference Type https://www.privoxy.org/announce.txt No Types Assigned https://www.privoxy.org/announce.txt Release Notes, Vendor Advisory
    Added CPE Configuration OR *cpe:2.3:a:privoxy:privoxy:*:*:*:*:*:*:*:* versions up to (excluding) 3.0.32
    Added CPE Configuration OR *cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
  • CVE Modified by [email protected]

    Mar. 09, 2021

    Action Type Old Value New Value
    Added Reference https://lists.debian.org/debian-lts-announce/2021/03/msg00009.html [No Types Assigned]
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-2021-20275 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-2021-20275 weaknesses.

CAPEC-8: Buffer Overflow in an API Call Buffer Overflow in an API Call CAPEC-9: Buffer Overflow in Local Command-Line Utilities Buffer Overflow in Local Command-Line Utilities CAPEC-10: Buffer Overflow via Environment Variables Buffer Overflow via Environment Variables CAPEC-14: Client-side Injection-induced Buffer Overflow Client-side Injection-induced Buffer Overflow CAPEC-24: Filter Failure through Buffer Overflow Filter Failure through Buffer Overflow CAPEC-42: MIME Conversion MIME Conversion CAPEC-44: Overflow Binary Resource File Overflow Binary Resource File CAPEC-45: Buffer Overflow via Symbolic Links Buffer Overflow via Symbolic Links CAPEC-46: Overflow Variables and Tags Overflow Variables and Tags CAPEC-47: Buffer Overflow via Parameter Expansion Buffer Overflow via Parameter Expansion CAPEC-100: Overflow Buffers Overflow Buffers CAPEC-123: Buffer Manipulation Buffer Manipulation CAPEC-540: Overread Buffers Overread Buffers
Exploit Prediction

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

0.17 }} 0.02%

score

0.53303

percentile

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