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CVE-2021-27385· NVD / CVE Program· CNA siemens

A vulnerability has been identified in SIMATIC HMI Comfort Outdoor Panels V15 7\" & 15\" (incl.

Noroxi assessment

Priority: Monitor (action score 31/100)

  • 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: 2.5% (FIRST EPSS); higher than 84.6% 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

A vulnerability has been identified in SIMATIC HMI Comfort Outdoor Panels V15 7\" & 15\" (incl. SIPLUS variants) (All versions < V15.1 Update 6), SIMATIC HMI Comfort Outdoor Panels V16 7\" & 15\" (incl. SIPLUS variants) (All versions < V16 Update 4), SIMATIC HMI Comfort Panels V15 4\" - 22\" (incl. SIPLUS variants) (All versions < V15.1 Update 6), SIMATIC HMI Comfort Panels V16 4\" - 22\" (incl. SIPLUS variants) (All versions < V16 Update 4), SIMATIC HMI KTP Mobile Panels V15 KTP400F, KTP700, KTP700F, KTP900 and KTP900F (All versions < V15.1 Update 6), SIMATIC HMI KTP Mobile Panels V16 KTP400F, KTP700, KTP700F, KTP900 and KTP900F (All versions < V16 Update 4), SIMATIC WinCC Runtime Advanced V15 (All versions < V15.1 Update 6), SIMATIC WinCC Runtime Advanced V16 (All versions < V16 Update 4), SINAMICS GH150 (All versions), SINAMICS GL150 (with option X30) (All versions), SINAMICS GM150 (with option X30) (All versions), SINAMICS SH150 (All versions), SINAMICS SL150 (All versions), SINAMICS SM120 (All versions), SINAMICS SM150 (All versions), SINAMICS SM150i (All versions). A remote attacker could send specially crafted packets to SmartVNC device layout handler on client side, which could influence the amount of resources consumed and result in a Denial-of-Service (infinite loop) condition.

HighCVSS 7.5 · v3.1—No exploit No fix recorded
Published
May 12, 2021
Updated
Jun 16, 2026
EPSS
2.6% · 85th percentile

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 2.6%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

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-2021-27385

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 wincc runtime advanced
siemenssinamics sh150 firmware
siemenssinamics sh150
siemenssinamics sm150i firmware
siemenssinamics sm150i
siemenssinamics gh150 firmware
siemenssinamics gh150
siemenssinamics gl150 firmware
siemenssinamics gl150
siemenssinamics gm150 firmware
siemenssinamics gm150
siemenssinamics sl150 firmware

and 23 more

Affected versions

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

  • siemens simatic hmi comfort outdoor panels 15" firmwarebefore 16
  • siemens simatic hmi comfort outdoor panels 15" firmwarebefore 15.1
  • siemens simatic hmi comfort outdoor panels 15" firmware15.1
  • siemens simatic hmi comfort outdoor panels 15" firmware16
  • siemens simatic hmi comfort outdoor panels 7" firmwarebefore 15.1
  • siemens simatic hmi comfort outdoor panels 7" firmwarebefore 16
  • siemens simatic hmi comfort outdoor panels 7" firmware15.1
  • siemens simatic hmi comfort outdoor panels 7" firmware16
  • siemens simatic hmi comfort panels 22" firmwarebefore 15.1
  • siemens simatic hmi comfort panels 22" firmwarebefore 16
  • siemens simatic hmi comfort panels 22" firmware15.1
  • siemens simatic hmi comfort panels 22" firmware16
  • siemens simatic hmi comfort panels 4" firmwarebefore 15.1
  • siemens simatic hmi comfort panels 4" firmwarebefore 16
  • siemens simatic hmi comfort panels 4" firmware15.1
  • siemens simatic hmi comfort panels 4" firmware16
  • siemens simatic hmi ktp mobile panels ktp400f firmwarebefore 15.1
  • siemens simatic hmi ktp mobile panels ktp400f firmwarebefore 16
  • siemens simatic hmi ktp mobile panels ktp400f firmware15.1
  • siemens simatic hmi ktp mobile panels ktp400f firmware16

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 HMI Comfort Outdoor Panels V15 7\" & 15\" (incl. SIPLUS variants)

    • All versions < V15.1 Update 6affected

  • Siemens SIMATIC HMI Comfort Outdoor Panels V16 7\" & 15\" (incl. SIPLUS variants)

    • All versions < V16 Update 4affected

  • Siemens SIMATIC HMI Comfort Panels V15 4\" - 22\" (incl. SIPLUS variants)

    • All versions < V15.1 Update 6affected

  • Siemens SIMATIC HMI Comfort Panels V16 4\" - 22\" (incl. SIPLUS variants)

    • All versions < V16 Update 4affected

  • Siemens SIMATIC HMI KTP Mobile Panels V15 KTP400F, KTP700, KTP700F, KTP900 and KTP900F

    • All versions < V15.1 Update 6affected

  • Siemens SIMATIC HMI KTP Mobile Panels V16 KTP400F, KTP700, KTP700F, KTP900 and KTP900F

    • All versions < V16 Update 4affected

  • Siemens SIMATIC WinCC Runtime Advanced V15

    • All versions < V15.1 Update 6affected

  • Siemens SIMATIC WinCC Runtime Advanced V16

    • All versions < V16 Update 4affected

  • Siemens SINAMICS GH150

    • All versionsaffected

  • Siemens SINAMICS GL150 (with option X30)

    • All versionsaffected

  • Siemens SINAMICS GM150 (with option X30)

    • All versionsaffected

  • Siemens SINAMICS SH150

    • All versionsaffected

Same product

siemens: all records

Other highest-scoring records for the same primary product.

  • CVE-2021-27384A vulnerability has been identified in SIMATIC HMI Comfort Outdoor Panels V15 7\" & 15\" (incl.
    40Plan
  • CVE-2021-27386A vulnerability has been identified in SIMATIC HMI Comfort Outdoor Panels V15 7\" & 15\" (incl.
    31Monitor
  • CVE-2021-27383A vulnerability has been identified in SIMATIC HMI Comfort Outdoor Panels V15 7\" & 15\" (incl.
    31Monitor
  • CVE-2021-25662A vulnerability has been identified in SIMATIC HMI Comfort Outdoor Panels V15 7\" & 15\" (incl.
    30Monitor
  • CVE-2021-25661A vulnerability has been identified in SIMATIC HMI Comfort Outdoor Panels V15 7\" & 15\" (incl.
    30Monitor

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

Weakness class (CWE)

CWE-400 · Uncontrolled Resource Consumption

CVSS vector

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

nvd-primary

Root cause

Code that parses nested structures sets no depth or size limit. A small input can turn into a disproportionate processing load.

The bug in code

The whole CWE-400 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

ts
function expand(node) {  return node.children.map(expand);}

Fixed

ts
const MAX_DEPTH = 32;function expand(node, depth = 0) {  if (depth > MAX_DEPTH) throw new Error("too deep");  return node.children.map((c) => expand(c, depth + 1));}

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

Show all references (2 more)

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

All records