Cisco SD-WAN Solution Certificate Validation Vulnerability

published 2018-10-05 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-1257

cvss: 7.4; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.8%; EPSS 0.8% chance of exploitation in 30 days, percentile 57%
public exploits: 0; none known

A vulnerability in the Zero Touch Provisioning feature of the Cisco SD-WAN Solution could allow an unauthenticated, remote attacker to gain unauthorized access to sensitive data by using an invalid certificate. The vulnerability is due to insufficient certificate validation by the affected software. An attacker could exploit this vulnerability by supplying a crafted certificate to an affected device. A successful exploit could allow the attacker to conduct man-in-the-middle attacks to decrypt confidential information on user connections to the affected software.

Patch / fix

fixed in 4

cisco vedge_100_firmware 18.3.0
cisco vedge_1000_firmware 18.3.0
cisco vedge_2000_firmware 18.3.0
cisco vedge_5000_firmware 18.3.0

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: total
Assessed: 23 mo ago (2024-11-25)

Exploit prediction

0.83% chance of exploitation in the next 30 days, higher than 57% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by	version	score	vector
NVD	3.0	7.4	CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
NVD	2.0	5.8	AV:N/AC:M/Au:N/C:P/I:P/A:N

Affected products

Cisco Cisco SD-WAN Solution

Classification

Weakness

CWE-295 Improper Certificate Validation

References

tools.cisco.com /security/center/content/CiscoSecurityAdvisory/cisco-sa-20180905-sd-wan-validation
vendor-advisory
securityfocus.com /bid/105294
vdb-entry, third-party-advisory

Sources

CVE List CVE-2018-0434
NVD CVE-2018-0434

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary