CVE-2021-1614

Cisco SD-WAN Software Information Disclosure Vulnerability

MEDIUM

5.3

CVSS Score

Published: July 22, 2021 at 03:20 PM UTC

Updated: June 17, 2026 at 03:32 AM UTC

2 products affected across 1 vendorSd WANCisco SD-WAN Solution

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Severity

MEDIUM5.3

Exploit prediction

EPSS 1%

SSVC

No known exploit

Description

A vulnerability in the Multiprotocol Label Switching (MPLS) packet handling function of Cisco SD-WAN Software could allow an unauthenticated, remote attacker to gain access to information stored in MPLS buffer memory. This vulnerability is due to insufficient handling of malformed MPLS packets that are processed by a device that is running Cisco SD-WAN Software. An attacker could exploit this vulnerability by sending a crafted MPLS packet to an affected device that is running Cisco SD-WAN Software or Cisco SD-WAN vManage Software. A successful exploit could allow the attacker to gain unauthorized access to sensitive information.

Affected

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

Sd WAN · Cisco

95%

18.4.0 ≤ v < 18.4.619.2.0 ≤ v < 19.2.320.3 ≤ v < 20.3.220.4 ≤ v < 20.4.120.5 ≤ v < 20.5.1

Affected range stops below 18.4.6, so it looks safe — our inference, not a vendor statement

Affected range stops below 19.2.3, so it looks safe — our inference, not a vendor statement

Affected range stops below 20.3.2, so it looks safe — our inference, not a vendor statement

Affected range stops below 20.4.1, so it looks safe — our inference, not a vendor statement

Affected range stops below 20.5.1, so it looks safe — our inference, not a vendor statement

Cisco SD-WAN Solution · Cisco

60%

All versions

Remediation

No guide yet

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

Patch and advisory references

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdw-mpls-infodisclos-MSSRFkZq

References (1)

Vendor Advisoryx_refsource_CISCOPatch

Source: [email protected]

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdw-mpls-infodisclos-MSSRFkZq

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

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

CVSS

5.3MEDIUMcisco

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

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-126NVD-CWE-Other

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