Skip to content
Noroxi
NVD / CVE Program· CNA siemens

CVE-2021-27386: A vulnerability has been identified in SIMATIC HMI Comfort Outdoor Panels V15 7\" & 15\" (incl.

HighCVSS 7.5 · v3.1—No exploit No fix recorded

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: 1.8% (FIRST EPSS); higher than 79.1% 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

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). SmartVNC has a heap allocation leak vulnerability in the device layout handler on client side, which could result in a Denial-of-Service condition.

Published
May 12, 2021
Updated
Jun 16, 2026
EPSS
1.8% · 79th 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 · 1.8%

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-2021-27386

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

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits every 10 minutes on paid plans, on the hour on the free plan.

Your free account also gets you

  • CVE alerts: add the products and versions you run, get the new CVEs that affect them
  • Uptime monitoring: 1 site, instant email when it goes down
  • Add your domain: subdomains and takeover risk scanned every week (1 domain)
  • 10 scans an hour on the security tools, at most 30 a day (3 a day without an account), an API key and MCP
  • All your scans in one panel: findings, what changed in the last scan, a report per domain or per client (PDF, share link)
All free tools

Sign up with email · Have an account? Sign in

Free account, no card. Unfollow any time.

Don't want an account? Get "Exploited this week" by email every MondayDon't want an account? RSS feed for siemens records
Is your version affected? Check it

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.

We use this product, ask for help

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

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
Affected versions · NVD (20)

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

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-2021-27385A 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

Published before and after this one in the same product

  • ← EarlierCVE-2021-25661May 12, 2021 · A vulnerability has been identified in SIMATIC HMI Comfort Outdoor Panels V15 7\" & 15\" (incl.
    30Monitor
  • ← EarlierCVE-2021-25662May 12, 2021 · A vulnerability has been identified in SIMATIC HMI Comfort Outdoor Panels V15 7\" & 15\" (incl.
    31Monitor

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.

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

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-401 · Missing Release of Memory after Effective Lifetime

CVSS vector

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

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.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

References

Show all references (2 more)

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

All records