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NVD / CVE Program· CNA mitre

CVE-2021-29998: An issue was discovered in Wind River VxWorks before 6.5.

CriticalCVSS 9.8 · v3.1—No exploit No fix recorded

Noroxi assessment

Priority: Plan (action score 40/100)

  • 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: 4.2% (FIRST EPSS); higher than 91.1% 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 the record, no fixed version is available yet.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Add it to your regular patch cycle. 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

An issue was discovered in Wind River VxWorks before 6.5. There is a possible heap overflow in dhcp client.

Published
Apr 13, 2021
Updated
Jun 16, 2026
EPSS
4.2% · 91th percentile

Report tools

JSON

Action score

40

Plan

Add it to your regular patch cycle.

CVSS
39 / 40 · 9.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 4.2%

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-2021-29998

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
windrivervxworks
siemensruggedcom win subscriber station firmware
siemensruggedcom win subscriber station
siemensscalance x200-4 p irt firmware
siemensscalance x200-4 p irt
siemensscalance x201-3p irt firmware
siemensscalance x201-3p irt
siemensscalance x201-3p irt pro firmware
siemensscalance x201-3p irt pro
siemensscalance x202-2 irt firmware
siemensscalance x202-2 irt
siemensscalance x202-2p irt firmware

and 59 more

Affected versions

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

  • siemens ruggedcom win subscriber station firmwareall versions
  • siemens scalance x200-4 p irt firmwareall versions
  • siemens scalance x201-3p irt firmwareall versions
  • siemens scalance x201-3p irt pro firmwareall versions
  • siemens scalance x202-2 irt firmwareall versions
  • siemens scalance x202-2p irt firmwareall versions
  • siemens scalance x202-2p irt pro firmwareall versions
  • siemens scalance x204 irt firmwareall versions
+12 more rows
  • siemens scalance x204 irt pro firmwareall versions
  • siemens scalance x204-2 firmwareall versions
  • siemens scalance x204-2fm firmwareall versions
  • siemens scalance x204-2ld firmwareall versions
  • siemens scalance x204-2ld ts firmwareall versions
  • siemens scalance x204-2ts firmwareall versions
  • siemens scalance x206-1 firmwareall versions
  • siemens scalance x206-1ld firmwareall versions
  • siemens scalance x208 firmwareall versions
  • siemens scalance x208 pro firmwareall versions
  • siemens scalance x212-2 firmwareall versions
  • siemens scalance x212-2ld firmwareall versions

Same product

windriver: all records

Other highest-scoring records for the same primary product.

  • CVE-2019-12255Wind River VxWorks has a Buffer Overflow in the TCP component (issue 1 of 4).
    62This week
  • CVE-2019-12258Wind River VxWorks 6.6 through vx7 has Session Fixation in the TCP component.
    60This week
  • CVE-2019-12257Wind River VxWorks 6.6 through 6.9 has a Buffer Overflow in the DHCP client component.
    60This week

Published before and after this one in the same product

  • ← EarlierCVE-2016-20009Mar 11, 2021 · A DNS client stack-based buffer overflow in ipdnsc_decode_name() affects Wind River VxWorks 6.5 through 7.
    40Plan
  • ← EarlierCVE-2021-29997Apr 13, 2021 · An issue was discovered in Wind River VxWorks 7 before 21.03.
    21Monitor
  • Later →CVE-2021-29999Apr 13, 2021 · An issue was discovered in Wind River VxWorks through 6.8.
    40Plan

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).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Not on record for this CVE: 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
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-787 · Out-of-bounds Write

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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 (3 more)

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

All records