No exploitation reportedFix available

CVE-2021-29998

No exploitation reported by the sources we read.

Published2021-04-13
WeaknessCWE-787

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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

Timeline

dates in UTC

2021-04-1317:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-29998?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-29998?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Siemens ruggedcom win subscriber station firmwareversion to verify

Branch	Affected	Fixed in	Source
—	all versions	no fix published	NVD

Siemens scalance x200-4 p irt firmwareversion to verify

Branch	Affected	Fixed in	Source
—	all versions	no fix published	NVD

Siemens scalance x201-3p irt firmwareversion to verify

Branch	Affected	Fixed in	Source
—	all versions	no fix published	NVD

33 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

ICSA-22-102-02 CISA1 known affected
Mitsubishi Electric MELSEC-Q Series C Controller Module
Module Q12DCCPU-V: First 5 digits of serial number 24031 and prior
ICSA-21-194-12 CISA110 known affected
Siemens VxWorks-based Industrial Products (Update C)
SCALANCE X208PRO (6GK5208-0HA10-2AA6): All versions · SCALANCE X202-2P IRT PRO (6GK5202-2JR00-2BA6): All versions · SCALANCE X308-2M (6GK5308-2GG00-2AA2): All versions · +107 more

Full record on NVD

Fix

Vendor fix CISA ICSA-21-194-12 · 110 productsSiemens recommends that the affected product versions listed as All versions prior to v4.1.4 to Update to v4.1.4 or later.
Vendor fix CISA ICSA-21-194-12 · 110 productsFor SINAMICS PERFECT HARMONY GH180 Drives:
Vendor fix CISA ICSA-21-194-12 · 110 productsAs a general security measure, Siemens strongly recommends protecting network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends configuring the environment according to Siemens Operational Guidelines for Industrial Secur…
Vendor fix CISA ICSA-21-194-12 · 110 productsAdditional information on industrial security by Siemens can be found at: https://www.siemens.com/industrialsecurity.
Vendor fix CISA ICSA-21-194-12 · 110 productsFor more information about this vulnerability and the associated remediations, please see Siemens publication number SSA-560465.
Mitigation from the vendor CISA ICSA-22-102-02 · 1 productUpdate to 24032 (first 5 digits of serial number) or later. Contact a Mitsubishi Electric representative for more information.

Advisories and patches

support2.windriver.comVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.19.8read 2026-10-23
NVDCVSS 2.07.5read 2026-10-23
NVDweakness (CWE)CWE-787read 2026-10-23
FIRST EPSSEPSS score2.4 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: 2021-04-13
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2021-29998?

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

Is CVE-2021-29998 actively exploited?

Active exploitation of CVE-2021-29998 has not been confirmed. Its EPSS score was 2.4% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-29998?

CVE-2021-29998 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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