CVE-2019-3404: By adding some special fields to the uri ofrouter app function, the user could abuse background app cgi functi

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HIGH 7.5REMOTEMITIGATEMITIGATE

CVE-2019-3404 is a high-severity flaw (CVSS 7.5) affecting p0 router firmware, f5c router firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

By adding some special fields to the uri ofrouter app function, the user could abuse background app cgi functions withoutauthentication. This affects 360 router P0 and F5C.

Why this priority

High severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

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 40%)
CISA exploited list	No
Published	2020-03-04
Last modified	2026-06-17

Publisher (CNA): 360 Security Technology, Inc. · Vendor: 360

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

Am I affected?

Timeline

2020-03-04 14:15 UTCPublished CVE record published
2026-06-17 02:35 UTCUpdated Record last modified

360 p0 router firmware MITIGATE

Affected: 3.1.1.65150

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.1.1.65150

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

360 f5c router firmware MITIGATE

Affected: 3.1.1.65150

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.1.1.65150

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

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-2019-3404?

p0 router firmware: mitigate or apply the listed mitigation; f5c router firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2019-3404 being exploited?

CVE-2019-3404 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-2019-3404 affect?

CVE-2019-3404 affects p0 router firmware, f5c router firmware. Severity is high (CVSS 7.5). By adding some special fields to the uri ofrouter app function, the user could abuse background app cgi functions withoutauthentication. This affects 360 router P0 and F5C.

How urgent is CVE-2019-3404?

Priority 46/100. High severity; Remotely exploitable, no login, no user action

References

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