CVE-2018-7340: Duo Network Gateway 1.2.9 and earlier may incorrectly utilize the results of XML DOM traversal and canonicaliz

Q: How do I fix CVE-2018-7340?

duo network gateway: upgrade to newer than 1.2.9. Exact commands for each OS are on this page.

Q: Is CVE-2018-7340 being exploited?

CVE-2018-7340 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2018-7340 affect?

CVE-2018-7340 affects duo network gateway. Severity is high (CVSS 7.5). Duo Network Gateway 1.2.9 and earlier may incorrectly utilize the results of XML DOM traversal and canonicalization APIs in such a way that an attacker may be able to manipulate the SAML data without invalidating the cryptographic signature

Q: How urgent is CVE-2018-7340?

Priority 51/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.5REMOTEUPGRADE

CVE-2018-7340 is a high-severity flaw (CVSS 7.5) affecting duo network gateway. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Duo Network Gateway 1.2.9 and earlier may incorrectly utilize the results of XML DOM traversal and canonicalization APIs in such a way that an attacker may be able to manipulate the SAML data without invalidating the cryptographic signature, allowing the attack to potentially bypass authentication to SAML service providers.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.9% (top 39%)
CISA exploited list	No
Weakness	CWE-287, CWE-347
Published	2019-04-17
Last modified	2026-06-17

Publisher (CNA): Duo Security, Inc. · Vendor: cisco

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2019-04-17 15:29 UTCPublished CVE record published
2026-06-17 02:03 UTCUpdated Record last modified

cisco duo network gateway UPGRADE

Affected: <= 1.2.9

Fixed in: newer than 1.2.9

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy duo-network-gateway || rpm -q duo-network-gateway || duo-network-gateway --version

2. UPGRADE to newer than 1.2.9 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade duo-network-gateway

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade duo-network-gateway

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2018-7340?

duo network gateway: upgrade to newer than 1.2.9. Exact commands for each OS are on this page.

Is CVE-2018-7340 being exploited?

CVE-2018-7340 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2018-7340 affect?

CVE-2018-7340 affects duo network gateway. Severity is high (CVSS 7.5). Duo Network Gateway 1.2.9 and earlier may incorrectly utilize the results of XML DOM traversal and canonicalization APIs in such a way that an attacker may be able to manipulate the SAML data without invalidating the cryptographic signature

How urgent is CVE-2018-7340?

Priority 51/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Cisco vulnerabilities

Related CVEs

CVE-2020-3483 HIGH 7.1 UPGRADE Duo has identified and fixed an issue with the Duo Network Gateway (DNG) product in which some customer-provid

References

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