FreeRDP up to 3.24.1 kerberos.c kerberos_AcceptSecurityContext double free

CVSS Meta Temp Score
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CTI Interest Score
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5.2$0-$5k0.00

Summaryinfo

A vulnerability labeled as problematic has been found in FreeRDP up to 3.24.1. This vulnerability affects the function kerberos_AcceptSecurityContext in the library winpr/libwinpr/sspi/Kerberos/kerberos.c. Executing a manipulation can lead to double free. This vulnerability is registered as CVE-2026-33995. It is possible to launch the attack remotely. No exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability has been found in FreeRDP up to 3.24.1 and classified as problematic. This vulnerability affects the function kerberos_AcceptSecurityContext in the library winpr/libwinpr/sspi/Kerberos/kerberos.c. The manipulation with an unknown input leads to a double free vulnerability. The CWE definition for the vulnerability is CWE-415. The product calls free() twice on the same memory address, potentially leading to modification of unexpected memory locations. As an impact it is known to affect availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-33995 since 03/24/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 312138 (SUSE SLES16 Security Update : freerdp (SUSE-SU-2026:21436-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 3.24.2 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (312138), EUVD (EUVD-2026-17237) and CERT Bund (WID-SEC-2026-0880). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Fedora Linux
  • SUSE Linux
  • Oracle Linux
  • SUSE openSUSE
  • RESF Rocky Linux
  • Open Source FreeRDP

Productinfo

Type

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.2

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 5.3
CNA Vector (GitHub_M): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Double free
CWE: CWE-415 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 312138
Nessus Name: SUSE SLES16 Security Update : freerdp (SUSE-SU-2026:21436-1)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: FreeRDP 3.24.2

Timelineinfo

03/24/2026 CVE reserved
03/30/2026 +6 days VulDB entry created
03/31/2026 +0 days Advisory disclosed
05/13/2026 +43 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-33995 (🔒)
GCVE (CVE): GCVE-0-2026-33995
GCVE (VulDB): GCVE-100-354280
EUVD: 🔒
CERT Bund: WID-SEC-2026-0880 - FreeRDP: Mehrere Schwachstellen

Entryinfo

Created: 03/31/2026 00:21
Updated: 05/13/2026 21:12
Changes: 03/31/2026 00:21 (64), 03/31/2026 02:30 (1), 04/18/2026 20:53 (7), 04/20/2026 14:48 (1), 05/05/2026 19:54 (2), 05/13/2026 21:12 (1)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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