PT-2021-4818 · Cisco · Cisco Ios Xe Sd-Wan

James Spadaro · Published 2021-09-22 · Updated 2023-05-22 · CVE-2021-34727

Positive Technologies (AI Summary)

CVSS v2.0

10

Critical

Base vector

AV:N/AC:L/Au:N/C:C/I:C/A:C

Name of the Vulnerable Software and Affected Versions Cisco IOS XE SD-WAN Software (affected versions not specified)

Description The issue is related to insufficient bounds checking when processing traffic, which could allow a remote attacker to cause a buffer overflow on an affected device. An attacker could exploit this by sending crafted traffic to the device, potentially allowing them to execute arbitrary commands with root-level privileges or cause the device to reload, resulting in a denial of service condition.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Buffer Overflow

Weakness Enumeration

CWE-120

Related Identifiers

BDU:2021-05546

CVE-2021-34727

Affected Products

Cisco Ios Xe Sd-Wan

References · 6

• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxesdwan-rbuffover-vE2OB6tp · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-34727 · Security Note
• https://bdu.fstec.ru/vul/2021-05546 · Security Note
• https://t.me/cibsecurity/29254 · Telegram Post
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxesdwan-rbuffover-vE2OB6tp?vsfCisco20Security20AdvisoryvscatSecurity20IntelligencevstypeRSSvspCisco20IOS20XE20SD-WAN20Software20Buffer20Overflow20Vulnerabilityvsk1 · Note
• https://t.me/cvenotify/21323 · Telegram Post