HOMEVULNERABILITIESCVE-2017-7903
CRITICAL

CVE-2017-7903

CWE-521Published: June 30, 2017· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

A Weak Password Requirements issue was discovered in Rockwell Automation Allen-Bradley MicroLogix 1100 programmable-logic controllers 1763-L16AWA, Series A and B, Version 16.00 and prior versions; 1763-L16BBB, Series A and B, Version 16.00 and prior versions; 1763-L16BWA, Series A and B, Version 16.00 and prior versions; and 1763-L16DWD, Series A and B, Version 16.00 and prior versions and Allen-Bradley MicroLogix 1400 programmable logic controllers 1766-L32AWA, Series A and B, Version 16.00 and prior versions; 1766-L32BWA, Series A and B, Version 16.00 and prior versions; 1766-L32BWAA, Series A and B, Version 16.00 and prior versions; 1766-L32BXB, Series A and B, Version 16.00 and prior versions; 1766-L32BXBA, Series A and B, Version 16.00 and prior versions; and 1766-L32AWAA, Series A and B, Version 16.00 and prior versions. The affected products use a numeric password with a small maximum character size for the password.

NVD Source

Technical Analysis

CVE-2017-7903 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

rockwellautomation21 product(s)
1763-l16awa series a1763-l16awa series b1763-l16bbb series a1763-l16bbb series b1763-l16bwa series a1763-l16bwa series b1763-l16dwd series a1763-l16dwd series bab micrologix controller1766-l32awa series a1766-l32awa series b1766-l32awaa series a+9
Source: NVD CPE · 22 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://ics-cert.us-cert.gov/advisories/ICSA-17-115-04
PATCHhttps://ics-cert.us-cert.gov/advisories/ICSA-17-115-04

All References (4)

→
http://www.securitytracker.com/id/1038546
→
https://ics-cert.us-cert.gov/advisories/ICSA-17-115-04Patch · Third Party Advisory · US Government Resource
→
http://www.securitytracker.com/id/1038546
→
https://ics-cert.us-cert.gov/advisories/ICSA-17-115-04Patch · Third Party Advisory · US Government Resource

Quick Facts

CVE IDCVE-2017-7903
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-521
CISA KEVNo
Affected1 vendor(s)
PublishedJun 30, 2017

Related CVEs (CWE-521)

CVE-2019-9096
9.8
CVE-2020-6995
9.8
CVE-2020-9023
9.8
CVE-2019-19690
9.8
CVE-2019-19747
9.8
CVE-2020-6991
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2017-7903 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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