CVE-2017-16921

Name: CVE-2017-16921
Creator: NVD / NIST
Published: 2017-12-08T15:29:00.323+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 19.90%

Last modified Jun 17, 2026

CVE-2017-16921 is a vulnerability of currently unknown severity. In OTRS 6.0.x up to and including 6.0.1, OTRS 5.0.x up to and including 5.0.24, and OTRS 4.0.x up to and including 4.0.26, an attacker who is logged into OTRS as an agent can manipulate form parameters (related to PGP) and execute arbitrary shell commands with the permissions of the OTRS or web server user.. EPSS estimates a 19.90% chance of exploitation in the next 30 days.

Description

In OTRS 6.0.x up to and including 6.0.1, OTRS 5.0.x up to and including 5.0.24, and OTRS 4.0.x up to and including 4.0.26, an attacker who is logged into OTRS as an agent can manipulate form parameters (related to PGP) and execute arbitrary shell commands with the permissions of the OTRS or web server user.

Metrics

EPSS Probability

19.90%

97.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-78

Affected Software

Vendor	Product	Versions
Otrs	Otrs	4.0.1
Otrs	Otrs	4.0.2
Otrs	Otrs	4.0.3
Otrs	Otrs	4.0.4
Otrs	Otrs	4.0.5
Otrs	Otrs	4.0.6
Otrs	Otrs	4.0.7
Otrs	Otrs	4.0.8
Otrs	Otrs	4.0.9
Otrs	Otrs	4.0.10
Otrs	Otrs	4.0.11
Otrs	Otrs	4.0.12
Otrs	Otrs	4.0.13
Otrs	Otrs	4.0.14
Otrs	Otrs	4.0.15
Otrs	Otrs	4.0.16
Otrs	Otrs	4.0.17
Otrs	Otrs	4.0.18
Otrs	Otrs	4.0.19
Otrs	Otrs	4.0.20
Otrs	Otrs	4.0.21
Otrs	Otrs	4.0.22
Otrs	Otrs	4.0.23
Otrs	Otrs	4.0.24
Otrs	Otrs	4.0.25
Otrs	Otrs	4.0.26
Otrs	Otrs	5.0.0
Otrs	Otrs	5.0.1
Otrs	Otrs	5.0.2
Otrs	Otrs	5.0.3
Otrs	Otrs	5.0.4
Otrs	Otrs	5.0.5
Otrs	Otrs	5.0.6
Otrs	Otrs	5.0.7
Otrs	Otrs	5.0.8
Otrs	Otrs	5.0.9
Otrs	Otrs	5.0.10
Otrs	Otrs	5.0.11
Otrs	Otrs	5.0.12
Otrs	Otrs	5.0.13
Otrs	Otrs	5.0.14
Otrs	Otrs	5.0.15
Otrs	Otrs	5.0.16
Otrs	Otrs	5.0.17
Otrs	Otrs	5.0.18
Otrs	Otrs	5.0.19
Otrs	Otrs	5.0.20
Otrs	Otrs	5.0.21
Otrs	Otrs	5.0.22
Otrs	Otrs	5.0.23

Showing 50 of 56 affected configurations. See NVD for the full list.

References

http://packetstormsecurity.com/files/162295/OTRS-6.0.1-Remote-Command-Execution.html
https://lists.debian.org/debian-lts-announce/2017/12/msg00015.htmlMailing List, Third Party Advisory
https://www.debian.org/security/2017/dsa-4066Mailing List, Third Party Advisory
https://www.exploit-db.com/exploits/43853/Exploit, Third Party Advisory, VDB Entry
https://www.otrs.com/security-advisory-2017-09-security-update-otrs-framework/Issue Tracking, Patch, Vendor Advisory
http://packetstormsecurity.com/files/162295/OTRS-6.0.1-Remote-Command-Execution.html
https://lists.debian.org/debian-lts-announce/2017/12/msg00015.htmlMailing List, Third Party Advisory
https://www.debian.org/security/2017/dsa-4066Mailing List, Third Party Advisory
https://www.exploit-db.com/exploits/43853/Exploit, Third Party Advisory, VDB Entry
https://www.otrs.com/security-advisory-2017-09-security-update-otrs-framework/Issue Tracking, Patch, Vendor Advisory

Timeline

Published: Dec 8, 2017
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2017-16921?

How severe is CVE-2017-16921?

Severity scoring for CVE-2017-16921 is pending analysis. The EPSS model estimates a 19.90% probability of exploitation in the next 30 days.

How do I fix CVE-2017-16921?

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-2017-16921?

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

Scan your code now

Source: NVD / NIST