CVE-2020-3375

Cisco SD-WAN Solution Software Buffer Overflow Vulnerability

CRITICAL
9.8
CVSS Score
Published: July 31, 2020 at 12:00 AM UTC
Updated: June 17, 2026 at 03:18 AM UTC
3 products affected across 1 vendorSd WANIOS Xe Sd WANCisco SD-WAN vManage

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Severity
CRITICAL9.8
Exploit prediction
EPSS 4%
SSVC
No known exploit

Description

A vulnerability in Cisco SD-WAN Solution Software could allow an unauthenticated, remote attacker to cause a buffer overflow on an affected device. The vulnerability is due to insufficient input validation. An attacker could exploit this vulnerability by sending crafted traffic to an affected device. A successful exploit could allow the attacker to gain access to information that they are not authorized to access, make changes to the system that they are not authorized to make, and execute commands on an affected system with privileges of the root user.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v ≤ 16.9.016.12.0 ≤ v ≤ 16.12.417.2.0 ≤ v ≤ 17.2.1
v ≤ 18.3.018.4.0 ≤ v < 18.4.519.2.0 ≤ v < 19.2.219.3.0 ≤ v < 20.1.1
Affected range stops below 18.4.5, so it looks safe — our inference, not a vendor statement
Affected range stops below 19.2.2, so it looks safe — our inference, not a vendor statement
Affected range stops below 20.1.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

SSVC — Action Prioritization

SSVCNo known exploitAutomatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-119CWE-20

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