CVE-2017-2891

Name: CVE-2017-2891
Creator: NVD / NIST
Published: 2017-11-07T16:29:00.717+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 2.76%

Last modified Jun 17, 2026

CVE-2017-2891 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. An exploitable use-after-free vulnerability exists in the HTTP server implementation of Cesanta Mongoose 6.8. An ordinary HTTP POST request with a CGI target can cause a reuse of previously freed pointer potentially resulting in remote code execution. EPSS estimates a 2.76% chance of exploitation in the next 30 days.

Description

An exploitable use-after-free vulnerability exists in the HTTP server implementation of Cesanta Mongoose 6.8. An ordinary HTTP POST request with a CGI target can cause a reuse of previously freed pointer potentially resulting in remote code execution. An attacker needs to send this HTTP request over the network to trigger this vulnerability.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

2.76%

84.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-416

Affected Software

Vendor	Product	Versions
Cesanta	Mongoose	6.8

References

https://www.talosintelligence.com/vulnerability_reports/TALOS-2017-0398Exploit, Technical Description, Third Party Advisory
https://www.talosintelligence.com/vulnerability_reports/TALOS-2017-0398Exploit, Technical Description, Third Party Advisory

Timeline

Published: Nov 7, 2017
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2017-2891?

How severe is CVE-2017-2891?

CVE-2017-2891 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.76% probability of exploitation in the next 30 days.

How do I fix CVE-2017-2891?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2017-2891?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST