CVE-2021-34727: Cisco IOS XE SD-WAN Software Buffer Overflow Vulnerability
First published: Thu Sep 23 2021(Updated: )
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.
Credit: ykramarz@cisco.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco IOS XE SD-WAN | ||
| Cisco 1000 Integrated Services Router | ||
| Cisco 1100-4g\/6g Integrated Services Router | ||
| Cisco 1100-4p Integrated Services Router | ||
| Cisco 1100-8p Integrated Services Router | ||
| Cisco 1100 Integrated Services Router | ||
| Cisco 1101-4p Integrated Services Router | ||
| Cisco 1101 Integrated Services Router | ||
| Cisco 1109-2p Integrated Services Router | ||
| Cisco 1109-4p Integrated Services Router | ||
| Cisco 1109 Integrated Services Router | ||
| Cisco 1111x-8p Integrated Services Router | ||
| Cisco 1111x 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-x Integrated Services Router | ||
| Cisco 4451 Integrated Services Router | ||
| Cisco 4461 Integrated Services Router | ||
| Cisco ASR 1000 | ||
| Cisco Asr 1000-esp100 | ||
| Cisco Asr 1000-x | ||
| Cisco Asr 1000 Series | ||
| Cisco Asr 1000 Series Route Processor \(rp2\) | ||
| Cisco Asr 1000 Series Route Processor \(rp3\) | ||
| 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 Asr 1002-x | ||
| Cisco Asr 1002-x R | ||
| Cisco Asr 1004 | ||
| Cisco Asr 1006 | ||
| Cisco Asr 1006-x | ||
| Cisco Asr 1009-x | ||
| Cisco Asr 1013 | ||
| Cisco Asr 1023 | ||
| Cisco Csr 1000v |
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Reference Links
Frequently Asked Questions
What is CVE-2021-34727?
CVE-2021-34727 is a vulnerability in the vDaemon process in Cisco IOS XE SD-WAN Software that could allow an unauthenticated, remote attacker to cause a buffer overflow on an affected device.
How severe is CVE-2021-34727?
CVE-2021-34727 has a severity score of 9.8, which is considered critical.
Which software is affected by CVE-2021-34727?
Cisco IOS XE SD-WAN Software is affected by CVE-2021-34727.
How can an attacker exploit CVE-2021-34727?
An attacker can exploit CVE-2021-34727 by taking advantage of insufficient bounds checking in the affected device's traffic processing.
Where can I find more information about CVE-2021-34727?
You can find more information about CVE-2021-34727 [here](https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxesdwan-rbuffover-vE2OB6tp).
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- agent/severity
- agent/last-modified-date
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- agent/description
- vendor/cisco
- canonical/cisco ios xe sd-wan
- canonical/cisco 1000 integrated services router
- canonical/cisco 1100-4g\/6g integrated services router
- canonical/cisco 1100-4p integrated services router
- canonical/cisco 1100-8p integrated services router
- canonical/cisco 1100 integrated services router
- canonical/cisco 1101-4p integrated services router
- canonical/cisco 1101 integrated services router
- canonical/cisco 1109-2p integrated services router
- canonical/cisco 1109-4p integrated services router
- canonical/cisco 1109 integrated services router
- canonical/cisco 1111x-8p integrated services router
- canonical/cisco 1111x integrated services router
- canonical/cisco 111x integrated services router
- canonical/cisco 1120 integrated services router
- canonical/cisco 1160 integrated services router
- canonical/cisco 4000 integrated services router
- canonical/cisco 422 integrated services router
- canonical/cisco 4221 integrated services router
- canonical/cisco 4321 integrated services router
- canonical/cisco 4331 integrated services router
- canonical/cisco 4351 integrated services router
- canonical/cisco 4431 integrated services router
- canonical/cisco 4451-x integrated services router
- canonical/cisco 4451 integrated services router
- canonical/cisco 4461 integrated services router
- canonical/cisco asr 1000
- canonical/cisco asr 1000-esp100
- canonical/cisco asr 1000-x
- canonical/cisco asr 1000 series
- canonical/cisco asr 1000 series route processor \(rp2\)
- canonical/cisco asr 1000 series route processor \(rp3\)
- canonical/cisco asr 1001
- canonical/cisco asr 1001-hx
- canonical/cisco asr 1001-hx r
- canonical/cisco asr 1001-x
- canonical/cisco asr 1001-x r
- canonical/cisco asr 1002
- canonical/cisco asr 1002-hx
- canonical/cisco asr 1002-hx r
- canonical/cisco asr 1002-x
- canonical/cisco asr 1002-x r
- canonical/cisco asr 1004
- canonical/cisco asr 1006
- canonical/cisco asr 1006-x
- canonical/cisco asr 1009-x
- canonical/cisco asr 1013
- canonical/cisco asr 1023
- canonical/cisco csr 1000v