CVE-2021-34727
9.8
CRITICAL · CVSS 3.1 · EPSS 2.6% (pctl 85)
In your normal cycle
Critical by CVSS (9.8), but no sign of active exploitation.
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 an affected device processes traffic. An attacker could exploit this vulnerability by sending crafted traffic to the device. A successful exploit could allow the attacker to cause a buffer overflow and possibly execute arbitrary commands with root-level privileges, or cause the device to reload, which could result in a denial of service condition.
Scoring
| CVSS | 9.8 (CRITICAL, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 2.63% — more likely to be exploited than 85% of all CVEs |
| Weakness | CWE-120 |
| On CISA KEV | no |
| Public exploit | none known |
| Published | 2021-09-23 |
| Last modified | 2026-06-17 |
Affected (40)
| Vendor | Product |
|---|---|
| cisco | 1000 integrated services router |
| cisco | 1100 integrated services router |
| cisco | 1100-4g\/6g integrated services router |
| cisco | 1100-4p integrated services router |
| cisco | 1100-8p integrated services router |
| cisco | 1101 integrated services router |
| cisco | 1101-4p integrated services router |
| cisco | 1109 integrated services router |
| cisco | 1109-2p integrated services router |
| cisco | 1109-4p integrated services router |
| cisco | 1111x integrated services router |
| cisco | 1111x-8p integrated services router |
| cisco | 111x integrated services router |
| cisco | 1120 integrated services router |
| cisco | 1160 integrated services router |
| cisco | 4000 integrated services router |
| cisco | 422 integrated services router |
| cisco | 4221 integrated services router |
| cisco | 4321 integrated services router |
| cisco | 4331 integrated services router |
| cisco | 4351 integrated services router |
| cisco | 4431 integrated services router |
| cisco | 4451 integrated services router |
| cisco | 4451-x integrated services router |
| cisco | 4461 integrated services router |
| cisco | asr 1000 |
| cisco | asr 1000 series |
| cisco | asr 1000 series route processor \(rp2\) |
| cisco | asr 1000 series route processor \(rp3\) |
| cisco | asr 1000-esp100 |
| cisco | asr 1000-x |
| cisco | asr 1001 |
| cisco | asr 1001-hx |
| cisco | asr 1001-hx r |
| cisco | asr 1001-x |
| cisco | asr 1001-x r |
| cisco | asr 1002 |
| cisco | asr 1002-hx |
| cisco | asr 1002-hx r |
| cisco | ios xe sd-wan |
References
→ the Explorer · watch your stack · NVD