CVE-2026-33995Network attack vector

Client crash via stale Kerberos context handle

Published Mar 30, 2026 · Updated Mar 30, 2026

Double free in FreeRDP before 3.24.2 allows remote attackers to crash Kerberos-enabled RDP clients after failed NLA authentication. The Kerberos SSPI failure path frees its context but leaves PCtxtHandle pointing to released memory, so a later teardown frees the same context again. Exploitation requires a WITH_KRB5 build, a configured Kerberos realm, and a failed authentication after an earlier successful context call; the reported consequence is a client crash.

CVSS severity5.3
Medium
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Double free in FreeRDP before 3.24.2 allows remote attackers to crash Kerberos-enabled RDP clients after failed NLA authentication. The Kerberos SSPI failure path frees its context but leaves PCtxtHandle pointing to released memory, so a later teardown frees the same context again. Exploitation requires a WITH_KRB5 build, a configured Kerberos realm, and a failed authentication after an earlier successful context call; the reported consequence is a client crash.

The record

CVE
CVE-2026-33995
Published
Mar 30, 2026
Updated
Mar 30, 2026
Vendor
FreeRDP
Product
FreeRDP
Classifications
CWE-415, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 30, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 30, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 3.24.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

FreeRDP · FreeRDPversion=< 3.24.2

Published CVSS scores

5.3GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-415Double Free
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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