CVE-2023-1778: This vulnerability exists in GajShield Data Security Firewall firmware versions prior to v4.28 (except v4.21)

Q: How do I fix CVE-2023-1778?

data security firewall firmware: upgrade to 4.21, 4.28. Exact commands for each OS are on this page.

Q: Is CVE-2023-1778 being exploited?

CVE-2023-1778 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-2023-1778 affect?

CVE-2023-1778 affects data security firewall firmware. Severity is critical (CVSS 10.0). This vulnerability exists in GajShield Data Security Firewall firmware versions prior to v4.28 (except v4.21) due to insecure default credentials which allows remote attacker to login as superuser by using default username/password via web-

Q: How urgent is CVE-2023-1778?

Priority 57/100. Critical severity; Remotely exploitable, no login, no user action

This month

CRITICAL 10.0REMOTEUPGRADE

CVE-2023-1778 is a critical-severity flaw (CVSS 10.0) affecting data security firewall firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

This vulnerability exists in GajShield Data Security Firewall firmware versions prior to v4.28 (except v4.21) due to insecure default credentials which allows remote attacker to login as superuser by using default username/password via web-based management interface and/or exposed SSH port thereby enabling remote attackers to execute arbitrary commands with administrative/superuser privileges on the targeted systems. The vulnerability has been a

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	10.0 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.1% (top 34%)
CISA exploited list	No
Weakness	CWE-287, CWE-522
Published	2023-04-27
Last modified	2026-06-17

Publisher (CNA): Indian Computer Emergency Response Team (CERT-In) · Vendor: gajshield

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

Am I affected?

Timeline

2023-04-27 10:15 UTCPublished CVE record published
2026-06-17 05:28 UTCUpdated Record last modified

gajshield data security firewall firmware UPGRADE

Affected: < 4.21 · >= 4.22 and < 4.28

Fixed in: 4.21, 4.28

Safe to downgrade to: a release before 4.22

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-2023-1778?

data security firewall firmware: upgrade to 4.21, 4.28. Exact commands for each OS are on this page.

Is CVE-2023-1778 being exploited?

CVE-2023-1778 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-2023-1778 affect?

CVE-2023-1778 affects data security firewall firmware. Severity is critical (CVSS 10.0). This vulnerability exists in GajShield Data Security Firewall firmware versions prior to v4.28 (except v4.21) due to insecure default credentials which allows remote attacker to login as superuser by using default username/password via web-

How urgent is CVE-2023-1778?

Priority 57/100. Critical severity; Remotely exploitable, no login, no user action

References

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