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NVD / CVE Program· CNA siemens

CVE-2023-28831: The OPC UA implementations (ANSI C and C++) in affected products contain an integer overflow vulnerability that could cause the application

Noroxi assessment

Priority: Monitor (action score 34/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 1.1% (FIRST EPSS); higher than 66.3% of all records.
  • 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.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • According to the record, no fixed version is available yet.

Low priority for now. Update when a fix is released; follow the vendor's advisory.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

The OPC UA implementations (ANSI C and C++) in affected products contain an integer overflow vulnerability that could cause the application to run into an infinite loop during certificate validation. This could allow an unauthenticated remote attacker to create a denial of service condition by sending a specially crafted certificate.

HighCVSS 8.7 · v4.0—No exploit No fix recorded
Published
Sep 12, 2023
Updated
Jun 17, 2026
EPSS
1.1% · 66th percentile

Report tools

JSON

Action score

34

Monitor

Low priority for now.

CVSS
34 / 40 · 8.7 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 1.1%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · siemens
7.5
NVD has not scored this yet; the score shown is the CNA’s.

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

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

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • No fixed version yet

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2023-28831

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
siemenssimatic cloud connect 7 cc712 firmware
siemenssimatic cloud connect 7 cc712
siemenssimatic cloud connect 7 cc716 firmware
siemenssimatic cloud connect 7 cc716
siemenssimatic drive controller cpu 1504d tf firmware
siemenssimatic drive controller cpu 1504d tf
siemenssimatic drive controller cpu 1507d tf firmware
siemenssimatic drive controller cpu 1507d tf
siemenssimatic et 200sp open controller cpu firmware
siemenssimatic et 200sp open controller cpu
siemenssimatic s7-1200 cpu firmware
siemenssimatic s7-1200 cpu

and 144 more

Affected versions

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

  • siemens simatic cloud connect 7 cc712 firmwarebefore 2.2
  • siemens simatic cloud connect 7 cc716 firmwarebefore 2.2
  • siemens simatic drive controller cpu 1504d tf firmwarebefore 2.2
  • siemens simatic drive controller cpu 1507d tf firmwarebefore 2.9.7
  • siemens simatic et 200sp open controller cpu firmwarebefore 2.9.7
  • siemens simatic s7-1200 cpu firmwarebefore 3.0.3
  • siemens simatic s7-1500 cpu 1510sp f-1 pn firmwarebefore 3.0.3
  • siemens simatic s7-1500 cpu 1510sp-1 pn firmwarebefore 2.9.7
  • siemens simatic s7-1500 cpu 1511-1 pn firmwarebefore 21.9.7
  • siemens simatic s7-1500 cpu 1511c-1 pn firmwarebefore 30.0.0
  • siemens simatic s7-1500 cpu 1511f-1 pn firmwarebefore 2.9.7
  • siemens simatic s7-1500 cpu 1511t-1 pn firmwarebefore 2.9.7
  • siemens simatic s7-1500 cpu 1511tf-1 pn firmwarebefore 3.0.3
  • siemens simatic s7-1500 cpu 1512c-1 pn firmwarebefore 3.0.3
  • siemens simatic s7-1500 cpu 1512sp f-1 pn firmwarebefore 3.0.3
  • siemens simatic s7-1500 cpu 1512sp-1 pn firmwarebefore 2.9.7
  • siemens simatic s7-1500 cpu 1513-1 pn firmwarebefore 2.9.7
  • siemens simatic s7-1500 cpu 1513f-1 pn firmwarebefore 2.9.7
  • siemens simatic s7-1500 cpu 1513r-1 pn firmwarebefore 2.9.7
  • siemens simatic s7-1500 cpu 1514sp f-2 pn firmwarebefore 2.9.7

Versions reported by the vendor

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

  • Siemens SIMATIC BRAUMAT

    • before V8.1 SP1affected

  • Siemens SIMATIC Cloud Connect 7 CC712

    • before V2.2affected

  • Siemens SIMATIC Cloud Connect 7 CC716

    • before V2.2affected

  • Siemens SIMATIC Comfort/Mobile RT

    • all versionsaffected

  • Siemens SIMATIC Drive Controller CPU 1504D TF

    • before V2.9.7affected
    • V3.0.1 and later · before V3.0.3affected

  • Siemens SIMATIC Drive Controller CPU 1507D TF

    • before V2.9.7affected
    • V3.0.1 and later · before V3.0.3affected

  • Siemens SIMATIC ET 200SP CPU 1510SP F-1 PN

    • before V2.9.7affected
    • before V3.0.3affected

  • Siemens SIMATIC ET 200SP CPU 1510SP-1 PN

    • before V2.9.7affected
    • before V3.0.3affected

  • Siemens SIMATIC ET 200SP CPU 1512SP F-1 PN

    • before V2.9.7affected
    • before V3.0.3affected

  • Siemens SIMATIC ET 200SP CPU 1512SP-1 PN

    • before V2.9.7affected
    • before V3.0.3affected

  • Siemens SIMATIC ET 200SP CPU 1514SP F-2 PN

    • before V3.0.3affected

  • Siemens SIMATIC ET 200SP CPU 1514SP-2 PN

    • before V3.0.3affected

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.

No history yet (it accumulates with the daily EPSS job).

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
Integrity
Availability
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
X

Weakness class (CWE)

CWE-190 · Integer Overflow or Wraparound

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

nvd-secondary

Attack context

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

ATT&CK techniques

—

Change log

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

References

Show all references (3 more)

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

All records