CVE-2021-41511: The username and password field of login in Lodging Reservation Management System V1 can give access to any us

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2021-41511 is a critical-severity flaw (CVSS 9.8) affecting lodging reservation management system. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The username and password field of login in Lodging Reservation Management System V1 can give access to any user by using SQL injection to bypass authentication.

Why this priority

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

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

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	3.3% (top 11%)
CISA exploited list	No
Weakness	CWE-89
Published	2021-10-04
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: lodging reservation management system project

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

Am I affected?

Timeline

2021-10-04 13:15 UTCPublished CVE record published
2026-06-17 04:08 UTCUpdated Record last modified

lodging reservation management system project lodging reservation management system DOWNGRADE

Affected: 1.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0

1. Check installed version

apt-cache policy lodging-reservation-management-system || rpm -q lodging-reservation-management-system || lodging-reservation-management-system --version

2. No fixed release: DOWNGRADE to a release before 1.0 (Debian / Ubuntu)

apt-cache madison lodging-reservation-management-system sudo apt install lodging-reservation-management-system=<VERSION_BEFORE_1.0> sudo apt-mark hold lodging-reservation-management-system

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

dnf --showduplicates list lodging-reservation-management-system sudo dnf downgrade lodging-reservation-management-system-<VERSION_BEFORE_1.0> sudo dnf versionlock add lodging-reservation-management-system

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-2021-41511?

lodging reservation management system: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-41511 being exploited?

CVE-2021-41511 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-2021-41511 affect?

CVE-2021-41511 affects lodging reservation management system. Severity is critical (CVSS 9.8). The username and password field of login in Lodging Reservation Management System V1 can give access to any user by using SQL injection to bypass authentication.

How urgent is CVE-2021-41511?

Priority 66/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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