EUVD-2026-42388
GHSA-rgmm-652r-crf4
Severity by source
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:N/R:U/V:D/RE:M/U:Red
Network-reachable and unauthenticated (AV:N/PR:N), but AT:P conditions and unproven exploitation justify AC:H; memory corruption can yield full compromise so C/I/A:H.
Primary rating from Vendor (paloaltonetworks).
CVSS VectorVendor: paloaltonetworks
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:N/R:U/V:D/RE:M/U:Red
Lifecycle Timeline
3DescriptionCVE.org
Multiple buffer overflow vulnerabilities in the User-ID Terminal Server Agent (TSA) component of Palo Alto Networks PAN-OS software allow an unauthenticated attacker with network access to cause a denial of service (DoS) condition or potentially execute arbitrary code by sending specially crafted network traffic.
The security risk posed by this issue is minimized when the User-ID Terminal Server Agent connectivity is restricted to only trusted internal IP addresses according to our recommended best practice deployment guidelines https://docs.paloaltonetworks.com/ngfw/help/10-2/user-identification/device-user-identification-terminal-services-agents#:~:text=To%20minimize%20security%20risk%2C%20restrict%20TS%20Agent%20connectivity%20to%20trusted%20internal%20IP%20addresses%20only. .
Panorama is not impacted by this vulnerability.
AnalysisAI
Memory corruption in the User-ID Terminal Server Agent (TSA) of Palo Alto Networks PAN-OS lets an unauthenticated network attacker crash the service (DoS) or potentially execute arbitrary code by sending crafted traffic to the TSA listener. Multiple out-of-bounds write bugs are involved; the vendor's CVSS 4.0 vector flags the exploit as unproven (E:U), and no public exploit has been identified at time of analysis. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires network reachability to the User-ID Terminal Server Agent (TSA) listening service; the exploit is limited to environments where the optional TSA component is actually deployed. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Signals are mixed and point to elevated-but-not-emergency priority. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who can reach the TSA network listener - for example a malicious insider or a foothold on the internal segment where Terminal Server hosts live - sends specially crafted packets to the agent, overflowing a parsing buffer to crash the service and break user-ID mapping (DoS), or, under the right conditions, to corrupt memory toward code execution on the host. No credentials or user interaction are required, but the AT:P and E:U metrics indicate specific conditions must align and no proven exploit is publicly available. |
| Remediation | Apply the fixed PAN-OS / TS Agent release identified in the Palo Alto Networks advisory at https://security.paloaltonetworks.com/CVE-2026-0288 (the exact patched version is not present in the provided data and should be confirmed from that advisory before scheduling). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify all PAN-OS instances with TSA enabled and confirm network reachability from untrusted sources. …
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Threat intelligence, references, and detailed analysis are available after sign-in.
Palo Alto Networks PAN-OS management web interface contains an authentication bypass allowing unauthenticated attackers
GNU wget before 1.18 allows remote servers to write to arbitrary files by redirecting a request from HTTP to a crafted F
Buffer overflow in the management web interface in Palo Alto Networks PAN-OS before 5.0.20, 5.1.x before 5.1.13, 6.0.x b
A denial of service flaw was found in OpenSSL 0.9.8, 1.0.1, 1.0.2 through 1.0.2h, and 1.1.0 in the way the TLS/SSL proto
Palo Alto Networks PAN-OS management interface contains an authenticated file read vulnerability allowing reading of fil
An authentication bypass in Palo Alto Networks PAN-OS software enables an unauthenticated attacker with network access t
An OS Command Injection vulnerability in the PAN-OS management interface that allows authenticated administrators to exe
A privilege escalation vulnerability in Palo Alto Networks PAN-OS software allows a PAN-OS administrator with access to
A reflected cross-site scripting (XSS) vulnerability exists in the PAN-OS management web interface. Rated high severity
The device-management command-line interface in Palo Alto Networks PAN-OS before 3.1.12, 4.0.x before 4.0.10, and 4.1.x
Remote Code Execution in PAN-OS 7.1.18 and earlier, PAN-OS 8.0.11-h1 and earlier, and PAN-OS 8.1.2 and earlier with Glob
The DNS Proxy in Palo Alto Networks PAN-OS before 6.1.18, 7.x before 7.0.16, 7.1.x before 7.1.11, and 8.x before 8.0.3 a
Same weakness CWE-787 – Out-of-bounds Write
View allSame technique Memory Corruption
View allShare
External POC / Exploit Code
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