The web interface of the 1734-AENTR communication module mishandles authentication for HTTP POST requests.

published 2022-02-24 4 y ago modified 2026-06-17 4 mo ago also EUVD-2020-6640

cvss: 5.3; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 1.3%; EPSS 1.3% chance of exploitation in 30 days, percentile 69%
public exploits: 0; none known

The web interface of the 1734-AENTR communication module mishandles authentication for HTTP POST requests. A remote, unauthenticated attacker can send a crafted request that may allow for modification of the configuration settings.

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-21-063-01 updated 2021-03-04 cvss 7.5

Rockwell Automation 1734-AENTR Series B and Series C

Rockwell Automation Series B > 4.001, < 4.005, > 5.011, < 5.017 Rockwell Automation Series C 6.011 and 6.012
affected: vendor fix, mitigation “1734-AENTR Series C, update to firmware Version 6.013” compatibility.rockwellautomation.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

CISA SSVC

Exploitation: none
Automatable: yes
Technical impact: partial
Assessed: 18 mo ago (2025-04-17)

Exploit prediction

1.27% chance of exploitation in the next 30 days, higher than 69% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
NVD	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
CNA	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:N/I:P/A:N

Affected products

Rockwell Automation 1734-AENTR

Classification

Weakness

CWE-284 Improper Access Control
CWE-287 Improper Authentication

References

cisa.gov /uscert/ics/advisories/icsa-21-063-01
mitigation, third-party-advisory, us-government-resource

Sources

CVE List CVE-2020-14504
NVD CVE-2020-14504

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary