CVE-2023-5826: A vulnerability was found in Netentsec NS-ASG Application Security Gateway 6.3 and classified as critical

Routine

MEDIUM 5.5DOWNGRADE

CVE-2023-5826 is a medium-severity flaw (CVSS 5.5) affecting application security gateway. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability was found in Netentsec NS-ASG Application Security Gateway 6.3 and classified as critical. Affected by this issue is some unknown functionality of the file /admin/list_onlineuser.php. The manipulation of the argument SessionId leads to sql injection. The exploit has been disclosed to the public and may be used. The identifier of this vulnerability is VDB-243716. NOTE: We tried to contact the vendor early about the disclosure but t

Why this priority

Public exploit reference

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

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Adjacent network
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.8% (top 44%)
CISA exploited list	No
Weakness	CWE-89
Published	2023-10-27
Last modified	2026-06-17

Publisher (CNA): VulDB · Vendor: netentsec

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

Am I affected?

Timeline

2023-10-27 18:15 UTCPublished CVE record published
2026-06-17 06:49 UTCUpdated Record last modified

netentsec application security gateway DOWNGRADE

Affected: 6.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 6.3

1. Check installed version

apt-cache policy application-security-gateway || rpm -q application-security-gateway || application-security-gateway --version

2. No fixed release: DOWNGRADE to a release before 6.3 (Debian / Ubuntu)

apt-cache madison application-security-gateway sudo apt install application-security-gateway=<VERSION_BEFORE_6.3> sudo apt-mark hold application-security-gateway

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list application-security-gateway sudo dnf downgrade application-security-gateway-<VERSION_BEFORE_6.3> sudo dnf versionlock add application-security-gateway

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2023-5826?

application security gateway: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-5826 being exploited?

CVE-2023-5826 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-2023-5826 affect?

CVE-2023-5826 affects application security gateway. Severity is medium (CVSS 5.5). A vulnerability was found in Netentsec NS-ASG Application Security Gateway 6.3 and classified as critical. Affected by this issue is some unknown functionality of the file /admin/list_onlineuser.php. The manipulation of the argument Session

How urgent is CVE-2023-5826?

Priority 38/100. Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2024-6007 MEDIUM 6.3 DOWNGRADE A vulnerability classified as critical has been found in Netentsec NS-ASG Application Security Gateway 6.3
CVE-2024-5773 MEDIUM 6.3 DOWNGRADE A vulnerability, which was classified as critical, was found in Netentsec NS-ASG Application Security Gateway
CVE-2024-5772 MEDIUM 6.3 DOWNGRADE A vulnerability, which was classified as critical, has been found in Netentsec NS-ASG Application Security Gat
CVE-2024-5590 MEDIUM 6.3 DOWNGRADE A vulnerability was found in Netentsec NS-ASG Application Security Gateway 6.3
CVE-2024-5589 MEDIUM 6.3 DOWNGRADE A vulnerability was found in Netentsec NS-ASG Application Security Gateway 6.3

References

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