CVE-2021-1433
No exploitation reported by the sources we read.
- Published2021-03-24
- WeaknessCWE-119
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « 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
A vulnerability in the vDaemon process in Cisco IOS XE SD-WAN Software could allow an unauthenticated, remote attacker to cause a buffer overflow on an affected device. This vulnerability is due to insufficient bounds checking when the device processes traffic. An attacker could exploit this vulnerability by sending crafted traffic to the device. The attacker must have a man-in-the-middle position between Cisco vManage and an associated device that is running an affected version of Cisco IOS XE SD-WAN Software. An exploit could allow the attacker to conduct a controllable buffer overflow attack (and possibly execute arbitrary commands as the root user) or cause a device reload, resulting in a denial of service (DoS) condition.
Timeline
dates in UTC- 2021-03-2420:15CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-23 21:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-1433?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-1433?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 3.15 | = 3.15.1xbs | no fix published | NVD |
| 3.15 | = 3.15.2xbs | no fix published | NVD |
| 16.12 | = 16.12.1 | no fix published | NVD |
| 16.12 | = 16.12.1a | no fix published | NVD |
| 16.12 | = 16.12.1c | no fix published | NVD |
| 16.12 | = 16.12.1s | no fix published | NVD |
| 16.12 | = 16.12.1t | no fix published | NVD |
| 16.12 | = 16.12.1w | no fix published | NVD |
| 16.12 | = 16.12.1x | no fix published | NVD |
| 16.12 | = 16.12.1y | no fix published | NVD |
| 16.12 | = 16.12.1z | no fix published | NVD |
| 16.12 | = 16.12.1za | no fix published | NVD |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Fix
Advisories and patches
- tools.cisco.comVendor Advisory
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- Published
- 2021-03-24
- Last Modified
- 2026-06-17
- NVD status
- Modified
Frequently asked questions
What is CVE-2021-1433?
Is CVE-2021-1433 actively exploited?
What is the CVSS score for CVE-2021-1433?
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