How severe is CVE-2023-39420?

CVE-2023-39420 has a CVSS 3.x base score of 9.9, rated critical severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-39420 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (42nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-39420?

CVE-2023-39420 affects Resortdata Internet Reservation Module Next Generation. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-39420?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2023-39420 published?

CVE-2023-39420 was published on 2023-09-07 and last updated on 2026-06-17.

CVE-2023-39420

CVE-2023-39420 is a critical-severity vulnerability in Resortdata Internet Reservation Module Next Generation with a CVSS 3.x base score of 9.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-798.

Key facts

Severity: Critical (CVSS 3.x base score 9.9)
EPSS exploit prediction: 1% (42nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-798
Affected product: Resortdata Internet Reservation Module Next Generation
Published: 2023-09-07
Last modified: 2026-06-17

Description

The RDPCore.dll component as used in the IRM Next Generation booking engine, allows a remote user to connect to customers with an "admin" account and a corresponding password computed daily by a routine inside the DLL file. Once reverse-engineered, this routine can help an attacker generate the daily password and connect to application customers. Given that this is an administrative account, anyone logging into a customer deployment has full, unrestricted access to the application.

Frequently asked questions

What is CVE-2023-39420?: The RDPCore.dll component as used in the IRM Next Generation booking engine, allows a remote user to connect to customers with an "admin" account and a corresponding password computed daily by a routine inside the DLL file. Once reverse-engineered, this routine can help an attacker generate the daily password and connect to application customers. Given that this is an administrative account, anyone logging into a customer deployment has full, unrestricted access to the application.
How severe is CVE-2023-39420?: CVE-2023-39420 has a CVSS 3.x base score of 9.9, rated critical severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-39420 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (42nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-39420?: CVE-2023-39420 affects Resortdata Internet Reservation Module Next Generation. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-39420?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2023-39420 published?: CVE-2023-39420 was published on 2023-09-07 and last updated on 2026-06-17.

References

https://bitdefender.com/blog/labs/check-out-with-extra-charges-vulnerabilities-in-hotel-booking-engine-explained/

Affected products (1)

cpe:2.3:a:resortdata:internet_reservation_module_next_generation:5.3.2.15:*:*:*:*:*:*:*

More vulnerabilities in Resortdata Internet Reservation Module Next Generation

CVE-2023-39424 — Critical (CVSS 9.9): A vulnerability in RDPngFileUpload.dll, as used in the IRM Next Generation booking system, allows a remote attacker…
CVE-2023-39423 — High (CVSS 8.6): The RDPData.dll file exposes the /irmdata/api/common endpoint that handles session IDs, among other features. By…
CVE-2023-39421 — High (CVSS 7.7): The RDPWin.dll component as used in the IRM Next Generation booking engine includes a set of hardcoded API keys for…
CVE-2023-39422 — Medium (CVSS 6.5): The /irmdata/api/ endpoints exposed by the IRM Next Generation booking engine authenticates requests using HMAC…

All CVEs affecting Resortdata Internet Reservation Module Next Generation →

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