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CVE-2023-43699· NVD / CVE Program· CNA SICK AG

Improper Restriction of Excessive Authentication Attempts in RDT400 in SICK APU allows an unprivileged remote attacker to guess the passwor

Improper Restriction of Excessive Authentication Attempts in RDT400 in SICK APU allows an unprivileged remote attacker to guess the password via trial-and-error as the login attempts are not limited.

HighCVSS 7.5 · v3.1—No exploit No fix recorded
Published
Oct 9, 2023
Updated
Jun 17, 2026
EPSS
0.7% · 52th percentile
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Report tools

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Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.7%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
7.5
CNA · SICK AG
7.5
agree

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

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Affected systems

VendorProduct
sickapu0200 firmware
sickapu0200

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • sick apu0200 firmwarebefore 4.0.0.6

Versions reported by the vendor

Affected version ranges reported by the assigning authority (SICK AG). Independent of NVD's CPE analysis and usually ahead of it.

  • SICK AG APU0200

    • all versionsaffected

Same product

sick: all records

Other highest-scoring records for the same primary product.

  • CVE-2023-43696 Improper Access Control in SICK APU allows an unprivileged remote attacker to download as well as upload arbitrary files via anonymous acce
    39Monitor
  • CVE-2023-43700Missing Authorization in RDT400 in SICK APU allows an unprivileged remote attacker to modify data via HTTP requests that no not require auth
    30Monitor
  • CVE-2023-5100 Cleartext Transmission of Sensitive Information in RDT400 in SICK APU allows an unprivileged remote attacker to retrieve potentially sensit
    26Monitor
  • CVE-2023-43697 Modification of Assumed-Immutable Data (MAID) in RDT400 in SICK APU allows an unprivileged remote attacker to make the site unable to load
    26Monitor
  • CVE-2023-43698 Improper Neutralization of Input During Web Page Generation (’Cross-site Scripting’) in RDT400 in SICK APU allows an unprivileged remote at
    24Monitor
  • CVE-2023-5102 Insufficient Control Flow Management in RDT400 in SICK APU allows an unprivileged remote attacker to potentially enable hidden functionalit
    21Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
none
Availability
none
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
None
Availability impact
None

Weakness class (CWE)

CWE-307 · Improper Restriction of Excessive Authentication Attempts

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records