How severe is CVE-2026-22853?

CVE-2026-22853 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-22853 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-22853?

CVE-2026-22853 affects Freerdp. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-22853?

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.

Does CVE-2026-22853 have an EU (EUVD) identifier?

Yes. CVE-2026-22853 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-2674.

When was CVE-2026-22853 published?

CVE-2026-22853 was published on 2026-01-14 and last updated on 2026-06-30.

CVE-2026-22853

CVE-2026-22853 is a critical-severity vulnerability in Freerdp with a CVSS 3.x base score of 9.8. 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-787.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v4: 6.8
EPSS exploit prediction: 1% (47th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-2674
Weakness: CWE-787
Affected product: Freerdp
Published: 2026-01-14
Last modified: 2026-06-30

Description

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.20.1, RDPEAR’s NDR array reader does not perform bounds checking on the on‑wire element count and can write past the heap buffer allocated from hints, causing a heap buffer overflow in ndr_read_uint8Array. This vulnerability is fixed in 3.20.1.

Frequently asked questions

What is CVE-2026-22853?: FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.20.1, RDPEAR’s NDR array reader does not perform bounds checking on the on‑wire element count and can write past the heap buffer allocated from hints, causing a heap buffer overflow in ndr_read_uint8Array. This vulnerability is fixed in 3.20.1.
How severe is CVE-2026-22853?: CVE-2026-22853 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-22853 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-22853?: CVE-2026-22853 affects Freerdp. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-22853?: 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.
Does CVE-2026-22853 have an EU (EUVD) identifier?: Yes. CVE-2026-22853 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-2674.
When was CVE-2026-22853 published?: CVE-2026-22853 was published on 2026-01-14 and last updated on 2026-06-30.

References

Affected products (1)

cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:*

More vulnerabilities in Freerdp

CVE-2026-45700 — Critical (CVSS 9.8): FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.26.0, FreeRDP's planar bitmap decoder has…
CVE-2026-31806 — Critical (CVSS 9.8): FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.24.0, the gdi_surface_bits() function…
CVE-2026-25997 — Critical (CVSS 9.8): FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.23.0, `xf_clipboard_format_equal`…
CVE-2026-25959 — Critical (CVSS 9.8): FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.23.0, `xf_cliprdr_provide_data_`…
CVE-2026-25955 — Critical (CVSS 9.8): FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.23.0,…
CVE-2026-25953 — Critical (CVSS 9.8): FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.23.0,…

All CVEs affecting Freerdp →

Other CWE-787 (Out-of-bounds Write) vulnerabilities

CVE-2026-42369 — Critical (CVSS 10.0): GV-VMS V20 is a Video Monitoring Software used to gather the feeds of many surveillance cameras and manage other…
CVE-2026-4746 — Critical (CVSS 10.0): Out-of-bounds Write vulnerability in timeplus-io proton (base/poco/Foundation/src‎ modules). This vulnerability is…
CVE-2025-43300 — Critical (CVSS 10.0): An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 15.8.5 and iPadOS…
CVE-2025-24201 — Critical (CVSS 10.0): An out-of-bounds write issue was addressed with improved checks to prevent unauthorized actions. This issue is fixed in…
CVE-2024-42479 — Critical (CVSS 10.0): llama.cpp provides LLM inference in C/C++. The unsafe `data` pointer member in the `rpc_tensor` structure can cause…
CVE-2024-39791 — Critical (CVSS 10.0): Stack-based buffer overflow vulnerabilities affecting Vonets industrial wifi bridge relays and wifi bridge…

Browse all CWE-787 (Out-of-bounds Write) vulnerabilities →