CVE-2017-7924

mediumpriority · attend · 48EPSS 0.222 · 98 %ileexploit · functionalEUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

1 exploit · functional

Likely / severe?

22.2% (98th) EPSS

CVSS 5 · medium

Is it mine?

10 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · cisa_csaf_ot · nvd

EPSS · scored 2026-10-27

An Improper Input Validation issue was discovered in Rockwell Automation MicroLogix 1100 controllers 1763-L16BWA, 1763-L16AWA, 1763-L16BBB, and 1763-L16DWD. A remote, unauthenticated attacker could send a single, specially crafted Programmable Controller Communication Commands (PCCC) packet to the controller that could potentially cause the controller to enter a DoS condition.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

FixedMicroLogix 1100 Controllerscisa_csaf_ot
Rockwell Automation recommends updating to the latest firmware revision of MicroLogix 1100 controllers, Version FRN 16.0 or later.
http://compatibility.rockwellautomation.com/Pages/MultiProductDownload.aspx?Keyword=1763&crumb=112
MitigationMicroLogix 1100 Controllerscisa_csaf_ot
Reference Rockwell Automation's security page.
http://www.rockwellautomation.com/security/overview.page

cvss

Technical severity, 0–10. One row per scoring source.

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5–7.5

v2.05mediumAV:N/AC:L/Au:N/C:N/I:N/A:Pprimary · NVD / NIST USexploitability 10 · impact 2.9

v3.07.5highCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 3.6

v3.07.5highCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · CISA US

v3.07.3highCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:Fsecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-20USprimaryCWE-20US

exploits (1)

Public proof-of-concept and weaponised exploit code.

auxiliary/dos/scada/allen_bradley_pcccDoS Exploitation of Allen-Bradley's Legacy Protocol (PCCC)functional · metasploit

affected products (10)

Products and version ranges known to be affected.

MicroLogix 1100 controllers: 1763-L16AWAall versionscisa_csaf_otUS
MicroLogix 1100 controllers: 1763-L16BBBall versionscisa_csaf_otUS
MicroLogix 1100 controllers: 1763-L16BWAall versionscisa_csaf_otUS
MicroLogix 1100 controllers: 1763-L16DWDall versionscisa_csaf_otUS
Rockwell Automation MicroLogix 1100 Controllersall versionscisa_csaf_otUS
n/a Rockwell Automation MicroLogix 1100 Controllers≤ Rockwell Automation MicroLogix 1100 Controllersenisa_euvdEU
rockwellautomation 1763-l16awa firmwareall versionsnvdUScpe:2.3:o:rockwellautomation:1763-l16awa_firmware:*:*:*:*:*:*:*:*
rockwellautomation 1763-l16bbb firmwareall versionsnvdUScpe:2.3:o:rockwellautomation:1763-l16bbb_firmware:*:*:*:*:*:*:*:*
rockwellautomation 1763-l16bwa firmwareall versionsnvdUScpe:2.3:o:rockwellautomation:1763-l16bwa_firmware:*:*:*:*:*:*:*:*
rockwellautomation 1763-l16dwd firmwareall versionsnvdUScpe:2.3:o:rockwellautomation:1763-l16dwd_firmware:*:*:*:*:*:*:*:*

advisories (1)

Vendor and ecosystem advisories describing this.

ICSA-17-138-03Rockwell Automation MicroLogix 1100 Controllers2017-05-18icsa · cisa_csaf_otUS
Vendor: Rockwell Automation

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd cisa_csaf_ot nvd NVD CVE.org MITRE

published 2017-09-20modified 2026-06-17

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Related entries.

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+25171 more

references (7)

External citations — patches, advisories, analysis.

http://www.rockwellautomation.com/Patchcnnvd
https://ics-cert.us-cert.gov/advisories/ICSA-17-138-03 cnnvd
https://www.securityfocus.com/bid/99622 cnnvd
http://www.securityfocus.com/bid/99622 enisa_euvd
https://ics-cert.us-cert.gov/advisories/ICSA-17-138-03 enisa_euvd
http://www.securityfocus.com/bid/99622Third Party AdvisoryVDB Entrynvd
https://ics-cert.us-cert.gov/advisories/ICSA-17-138-03MitigationThird Party AdvisoryUS Government Resourcenvd

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