6.5
MEDIUM CVSS 3.1
CVE-2023-31147
Apache c-ares Non-Deterministic and Weakly Secured Random Number Generation and RC4 Implementation Vulnerability
Description

c-ares is an asynchronous resolver library. When /dev/urandom or RtlGenRandom() are unavailable, c-ares uses rand() to generate random numbers used for DNS query ids. This is not a CSPRNG, and it is also not seeded by srand() so will generate predictable output. Input from the random number generator is fed into a non-compilant RC4 implementation and may not be as strong as the original RC4 implementation. No attempt is made to look for modern OS-provided CSPRNGs like arc4random() that is widely available. This issue has been fixed in version 1.19.1.

INFO

Published Date :

May 25, 2023, 10:15 p.m.

Last Modified :

Nov. 21, 2024, 8:01 a.m.

Remotely Exploit :

Yes !
Affected Products

The following products are affected by CVE-2023-31147 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 Fedoraproject fedora
1 C-ares_project c-ares
1 C-ares c-ares
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 3.1 MEDIUM [email protected]
CVSS 3.1 MEDIUM [email protected]
Solution
Follow the instructions below to mitigate the CVE-2023-31147 vulnerability.
Update the affected packages.
Public PoC/Exploit Available at Github

CVE-2023-31147 has a 3 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2023-31147 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-2023-31147 weaknesses.

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).

None

Dockerfile Python Jupyter Notebook Shell

Updated: 1 week, 1 day ago
0 stars 0 fork 0 watcher
Born at : Aug. 13, 2025, 2:02 a.m. This repo has been linked 6 different CVEs too.

None

Dockerfile Python Jupyter Notebook Shell

Updated: 2 weeks ago
0 stars 0 fork 0 watcher
Born at : Aug. 7, 2025, 11:26 a.m. This repo has been linked 6 different CVEs too.

Rapidly identify and mitigate container security vulnerabilities with generative AI.

Dockerfile Python Shell Jupyter Notebook

Updated: 2 days, 4 hours ago
149 stars 58 fork 58 watcher
Born at : Sept. 26, 2024, 8:55 p.m. This repo has been linked 6 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-2023-31147 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2023-31147 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://github.com/c-ares/c-ares/releases/tag/cares-1_19_1
    Added Reference https://github.com/c-ares/c-ares/security/advisories/GHSA-8r8p-23f3-64c2
    Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/B5Z5XFNXTNPTCBBVXFDNZQVLLIE6VRBY/
    Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/UBFWILTA33LOSV23P44FGTQQIDRJHIY7/
    Added Reference https://security.gentoo.org/glsa/202310-09
  • CVE Modified by [email protected]

    May. 14, 2024

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

    Oct. 31, 2023

    Action Type Old Value New Value
    Changed Reference Type https://security.gentoo.org/glsa/202310-09 No Types Assigned https://security.gentoo.org/glsa/202310-09 Third Party Advisory
  • CVE Modified by [email protected]

    Oct. 08, 2023

    Action Type Old Value New Value
    Added Reference https://security.gentoo.org/glsa/202310-09 [No Types Assigned]
  • Initial Analysis by [email protected]

    Jun. 02, 2023

    Action Type Old Value New Value
    Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
    Changed Reference Type https://github.com/c-ares/c-ares/releases/tag/cares-1_19_1 No Types Assigned https://github.com/c-ares/c-ares/releases/tag/cares-1_19_1 Release Notes
    Changed Reference Type https://github.com/c-ares/c-ares/security/advisories/GHSA-8r8p-23f3-64c2 No Types Assigned https://github.com/c-ares/c-ares/security/advisories/GHSA-8r8p-23f3-64c2 Third Party Advisory
    Changed Reference Type https://lists.fedoraproject.org/archives/list/[email protected]/message/B5Z5XFNXTNPTCBBVXFDNZQVLLIE6VRBY/ No Types Assigned https://lists.fedoraproject.org/archives/list/[email protected]/message/B5Z5XFNXTNPTCBBVXFDNZQVLLIE6VRBY/ Mailing List, Third Party Advisory
    Changed Reference Type https://lists.fedoraproject.org/archives/list/[email protected]/message/UBFWILTA33LOSV23P44FGTQQIDRJHIY7/ No Types Assigned https://lists.fedoraproject.org/archives/list/[email protected]/message/UBFWILTA33LOSV23P44FGTQQIDRJHIY7/ Mailing List, Third Party Advisory
    Added CWE NIST CWE-330
    Added CPE Configuration OR *cpe:2.3:a:c-ares_project:c-ares:*:*:*:*:*:*:*:* versions up to (excluding) 1.19.1
    Added CPE Configuration OR *cpe:2.3:o:fedoraproject:fedora:37:*:*:*:*:*:*:* *cpe:2.3:o:fedoraproject:fedora:38:*:*:*:*:*:*:*
  • CVE Modified by [email protected]

    May. 28, 2023

    Action Type Old Value New Value
    Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/UBFWILTA33LOSV23P44FGTQQIDRJHIY7/ [No Types Assigned]
  • CVE Modified by [email protected]

    May. 26, 2023

    Action Type Old Value New Value
    Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/B5Z5XFNXTNPTCBBVXFDNZQVLLIE6VRBY/ [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.
Vulnerability Scoring Details
Base CVSS Score: 6.5
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact
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

0.26026

percentile