Vulnerability-Lookup

WID-SEC-W-2026-0880

Vulnerability from csaf_certbund - Published: 2026-03-25 23:00 - Updated: 2026-03-30 22:00

Summary

FreeRDP: Mehrere Schwachstellen

Severity

Mittel

Notes

Das BSI ist als Anbieter für die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch dafür verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgfältig im Einzelfall zu prüfen.

Produktbeschreibung: FreeRDP ist eine freie Implementierung des Remote Desktop Protocol (RDP).

Angriff: Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in FreeRDP ausnutzen, um potenziell beliebigen Code auszuführen, einen Denial-of-Service-Zustand herbeizuführen, Daten zu manipulieren, vertrauliche Informationen offenzulegen oder andere, nicht näher spezifizierte Angriffe durchzuführen.

Betroffene Betriebssysteme: - Sonstiges - UNIX - Windows

CVE-2026-33952

CVE-2026-33977

CVE-2026-33982

CVE-2026-33983

CVE-2026-33984

CVE-2026-33985

CVE-2026-33986

CVE-2026-33987

CVE-2026-33995

References

URL

CVE-2026-33977 (GCVE-0-2026-33977)

Vulnerability from cvelistv5 – Published: 2026-03-30 21:41 – Updated: 2026-03-31 19:09

Title

FreeRDP: DoS via WINPR_ASSERT in IMA ADPCM audio decoder (dsp.c:331)

Summary

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, a malicious RDP server can crash the FreeRDP client by sending audio data in IMA ADPCM format with an invalid initial step index value (>= 89). The unvalidated step index is read directly from the network and used to index into a 89-entry lookup table, triggering a WINPR_ASSERT() failure and process abort via SIGABRT. This affects any FreeRDP client that has audio redirection (RDPSND) enabled, which is the default configuration. This issue has been patched in version 3.24.2.

Severity ?

6.9 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CWE

CWE-617 - Reachable Assertion

Assigner

GitHub_M

References

URL

Tags

	https://github.com/FreeRDP/FreeRDP/security/advis…	x_refsource_CONFIRM
	https://github.com/FreeRDP/FreeRDP/commit/9be3f03…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	FreeRDP	FreeRDP	Affected: < 3.24.2

Show details on NVD website

JSON

To clipboard

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                "id": "CVE-2026-33977",
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CVE-2026-33984 (GCVE-0-2026-33984)

Vulnerability from cvelistv5 – Published: 2026-03-30 21:42 – Updated: 2026-04-02 12:57

Title

FreeRDP: ClearCodec resize_vbar_entry() Heap OOB Write

Summary

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, in resize_vbar_entry() in libfreerdp/codec/clear.c, vBarEntry->size is updated to vBarEntry->count before the winpr_aligned_recalloc() call. If realloc fails, size is inflated while pixels still points to the old, smaller buffer. On a subsequent call where count <= size (the inflated value), realloc is skipped. The caller then writes count * bpp bytes of attacker-controlled pixel data into the undersized buffer, causing a heap buffer overflow. This issue has been patched in version 3.24.2.

Severity ?

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

CWE

CWE-122 - Heap-based Buffer Overflow
CWE-131 - Incorrect Calculation of Buffer Size

Assigner

GitHub_M

References

URL

Tags

	https://github.com/FreeRDP/FreeRDP/security/advis…	x_refsource_CONFIRM
	https://github.com/FreeRDP/FreeRDP/commit/dc7fdb1…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	FreeRDP	FreeRDP	Affected: < 3.24.2

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
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                "id": "CVE-2026-33984",
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          "url": "https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-8469-2xcx-frf6"
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CVE-2026-33982 (GCVE-0-2026-33982)

Vulnerability from cvelistv5 – Published: 2026-03-30 21:42 – Updated: 2026-03-31 14:07

Title

FreeRDP: Persistent Cache Allocator Mismatch - Heap OOB Read

Summary

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, there is a heap-buffer-overflow READ vulnerability at 24 bytes before the allocation, in winpr_aligned_offset_recalloc(). This issue has been patched in version 3.24.2.

Severity ?

7.1 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H

CWE

CWE-125 - Out-of-bounds Read

Assigner

GitHub_M

References

URL

Tags

	https://github.com/FreeRDP/FreeRDP/security/advis…	x_refsource_CONFIRM
	https://github.com/FreeRDP/FreeRDP/commit/a48dbde…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	FreeRDP	FreeRDP	Affected: < 3.24.2

Show details on NVD website

JSON

To clipboard

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CVE-2026-33987 (GCVE-0-2026-33987)

Vulnerability from cvelistv5 – Published: 2026-03-30 21:43 – Updated: 2026-03-31 15:32

Title

FreeRDP: Persistent Cache bmpSize Desync - Heap OOB Write

Summary

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, in persistent_cache_read_entry_v3() in libfreerdp/cache/persistent.c, persistent->bmpSize is updated before winpr_aligned_recalloc(). If realloc fails, bmpSize is inflated while bmpData points to the old buffer. This issue has been patched in version 3.24.2.

Severity ?

7.1 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H

CWE

CWE-122 - Heap-based Buffer Overflow
CWE-131 - Incorrect Calculation of Buffer Size

Assigner

GitHub_M

References

URL

Tags

	https://github.com/FreeRDP/FreeRDP/security/advis…	x_refsource_CONFIRM
	https://github.com/FreeRDP/FreeRDP/commit/1a890eb…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	FreeRDP	FreeRDP	Affected: < 3.24.2

Show details on NVD website

JSON

To clipboard

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          ],
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CVE-2026-33983 (GCVE-0-2026-33983)

Vulnerability from cvelistv5 – Published: 2026-03-30 21:42 – Updated: 2026-03-31 15:32

Title

FreeRDP: Progressive Codec Quant BYTE Underflow - UB + CPU DoS

Summary

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, progressive_decompress_tile_upgrade() detects a mismatch via progressive_rfx_quant_cmp_equal() but only emits WLog_WARN, execution continues. The wrapped value (247) is used as a shift exponent, causing undefined behavior and an approximately 80 billion iteration loop (CPU DoS). This issue has been patched in version 3.24.2.

Severity ?

6.5 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

CWE

CWE-190 - Integer Overflow or Wraparound
CWE-252 - Unchecked Return Value

Assigner

GitHub_M

References

URL

Tags

	https://github.com/FreeRDP/FreeRDP/security/advis…	x_refsource_CONFIRM
	https://github.com/FreeRDP/FreeRDP/commit/78188ab…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	FreeRDP	FreeRDP	Affected: < 3.24.2

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
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        "metrics": [
          {
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CVE-2026-33952 (GCVE-0-2026-33952)

Vulnerability from cvelistv5 – Published: 2026-03-30 21:42 – Updated: 2026-04-02 14:11

Title

FreeRDP: DoS via WINPR_ASSERT in rts_read_auth_verifier_no_checks

Summary

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, an unvalidated auth_length field read from the network triggers a WINPR_ASSERT() failure in rts_read_auth_verifier_no_checks(), causing any FreeRDP client connecting through a malicious RDP Gateway to crash with SIGABRT. This is a pre-authentication denial of service affecting all FreeRDP clients using RPC-over-HTTP gateway transport. The assertion is active in default release builds (WITH_VERBOSE_WINPR_ASSERT=ON). This issue has been patched in version 3.24.2.

Severity ?

6 (Medium)


                        
                          CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CWE

CWE-617 - Reachable Assertion

Assigner

GitHub_M

References

URL

Tags

	https://github.com/FreeRDP/FreeRDP/security/advis…	x_refsource_CONFIRM
	https://github.com/FreeRDP/FreeRDP/commit/4ac0b64…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	FreeRDP	FreeRDP	Affected: < 3.24.2

Show details on NVD website

JSON

To clipboard

{
  "containers": {
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CVE-2026-33985 (GCVE-0-2026-33985)

Vulnerability from cvelistv5 – Published: 2026-03-30 21:43 – Updated: 2026-03-31 18:53

Title

FreeRDP: ClearCodec Glyph Cache Count Desync - Heap OOB Read

Summary

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, pixel data from adjacent heap memory is rendered to screen, potentially leaking sensitive data to the attacker. This issue has been patched in version 3.24.2.

Severity ?

5.9 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:L

CWE

CWE-125 - Out-of-bounds Read
CWE-131 - Incorrect Calculation of Buffer Size

Assigner

GitHub_M

References

URL

Tags

	https://github.com/FreeRDP/FreeRDP/security/advis…	x_refsource_CONFIRM
	https://github.com/FreeRDP/FreeRDP/commit/c49d1ad…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	FreeRDP	FreeRDP	Affected: < 3.24.2

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-33985",
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            "attackComplexity": "HIGH",
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CVE-2026-33995 (GCVE-0-2026-33995)

Vulnerability from cvelistv5 – Published: 2026-03-30 21:43 – Updated: 2026-04-02 14:13

Title

FreeRDP: Possible double free in kerberos_AcceptSecurityContext

Summary

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, a double-free vulnerability in kerberos_AcceptSecurityContext() and kerberos_InitializeSecurityContextA() (WinPR, winpr/libwinpr/sspi/Kerberos/kerberos.c) can cause a crash in any FreeRDP clients on systems where Kerberos and/or Kerberos U2U is configured (Samba AD member, or krb5 for NFS). The crash is triggered during NLA connection teardown and requires a failed authentication attempt. This issue has been patched in version 3.24.2.

Severity ?

5.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CWE

CWE-415 - Double Free

Assigner

GitHub_M

References

URL

Tags

	https://github.com/FreeRDP/FreeRDP/security/advis…	x_refsource_CONFIRM
	https://github.com/FreeRDP/FreeRDP/commit/8078b8a…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	FreeRDP	FreeRDP	Affected: < 3.24.2

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-33995",
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          "cvssV3_1": {
            "attackComplexity": "LOW",
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      "source": {
        "advisory": "GHSA-mv25-f4p2-5mxx",
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      "title": "FreeRDP: Possible double free in kerberos_AcceptSecurityContext"
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CVE-2026-33986 (GCVE-0-2026-33986)

Vulnerability from cvelistv5 – Published: 2026-03-30 21:43 – Updated: 2026-04-01 03:55

Title

FreeRDP: H.264 YUV Buffer Dimension Desync - Heap OOB Write

Summary

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, in yuv_ensure_buffer() in libfreerdp/codec/h264.c, h264->width and h264->height are updated before the reallocation loop. If any winpr_aligned_recalloc() call fails, the function returns FALSE but width/height are already inflated. This issue has been patched in version 3.24.2.

Severity ?

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

CWE

CWE-122 - Heap-based Buffer Overflow
CWE-131 - Incorrect Calculation of Buffer Size

Assigner

GitHub_M

References

URL

Tags

	https://github.com/FreeRDP/FreeRDP/security/advis…	x_refsource_CONFIRM
	https://github.com/FreeRDP/FreeRDP/commit/f6e43e2…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	FreeRDP	FreeRDP	Affected: < 3.24.2

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  "containers": {
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      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-33986",
                "options": [
                  {
                    "Exploitation": "none"
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                "role": "CISA Coordinator",
                "timestamp": "2026-03-31T00:00:00+00:00",
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      "references": [
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          "name": "https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-h6qw-wxvm-hf97",
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      "source": {
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      "title": "FreeRDP: H.264 YUV Buffer Dimension Desync - Heap OOB Write"
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Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

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