{"id":"CVE-2021-29998","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-29998","generatedAt":"2026-10-27T22:26:52.574Z","title":"There is a possible heap overflow in dhcp client.","description":"An issue was discovered in Wind River VxWorks before 6.5. There is a possible heap overflow in dhcp client.","published":"2021-04-13T17:15:12.000Z","lastModified":"2026-06-17T03:48:35.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.1","score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"cwe":["CWE-787"],"affected":["windriver/vxworks","siemens/ruggedcom win subscriber station firmware","siemens/scalance x200-4 p irt firmware","siemens/scalance x201-3p irt firmware","siemens/scalance x201-3p irt pro firmware","siemens/scalance x202-2 irt firmware","siemens/scalance x202-2p irt firmware","siemens/scalance x202-2p irt pro firmware","siemens/scalance x204 irt firmware","siemens/scalance x204 irt pro firmware","siemens/scalance x204-2 firmware","siemens/scalance x204-2fm firmware","siemens/scalance x204-2ld firmware","siemens/scalance x204-2ld ts firmware","siemens/scalance x204-2ts firmware","siemens/scalance x206-1 firmware","siemens/scalance x206-1ld firmware","siemens/scalance x208 firmware","siemens/scalance x208 pro firmware","siemens/scalance x212-2 firmware","siemens/scalance x212-2ld firmware","siemens/scalance x216 firmware","siemens/scalance x224 firmware","siemens/scalance x300 firmware","siemens/scalance x408 firmware","siemens/scalance xf201-3p irt firmware","siemens/scalance xf202-2p irt firmware","siemens/scalance xf204 firmware","siemens/scalance xf204 irt firmware","siemens/scalance xf204-2 firmware","siemens/scalance xf204-2ba irt firmware","siemens/scalance xf206-1 firmware","siemens/scalance xf208 firmware","siemens/simatic rf 181 eip firmware","siemens/simatic rf 182c firmware","siemens/sinamics perfect harmony gh180 firmware"],"epss":{"score":0.02393,"percentile":0.83865,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (2.39%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-560465.pdf","tags":["Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-910883.pdf","tags":["Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://support2.windriver.com/index.php?page=security-notices","tags":["Vendor Advisory"],"source":"cve@mitre.org"},{"url":"https://us-cert.cisa.gov/ics/advisories/icsa-21-194-12","tags":["Third Party Advisory","US Government Resource"],"source":"cve@mitre.org"},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-560465.pdf","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-910883.pdf","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://support2.windriver.com/index.php?page=security-notices","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://us-cert.cisa.gov/ics/advisories/icsa-21-194-12","tags":["Third Party Advisory","US Government Resource"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-29998","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}