{"document":{"category":"csaf_vex","csaf_version":"2.1","notes":[{"category":"summary","text":"Palo Alto Networks PSIRT provided VEX document. This document is autogenerated.","title":"App-ID Cache Poisoning"}],"publisher":{"category":"vendor","name":"Palo Alto Networks","namespace":"https://security.paloaltonetworks.com"},"title":"Palo Alto Networks PSIRT provided VEX document: CVE-2013-5663","distribution":{"text":"Copyright © 2024 Palo Alto Networks. All rights reserved.","tlp":{"label":"CLEAR","url":"https://www.first.org/tlp/"}},"tracking":{"current_release_date":"2026-04-11T00:52:29.038Z","generator":{"date":"2026-04-11T00:52:29.038Z","engine":{"name":"Vulnogram","version":"0.0.9"}},"id":"CVE-2013-5663","initial_release_date":"2013-01-07T08:00:00.000Z","revision_history":[{"number":"1","date":"2026-04-10T17:52:29.000Z","summary":"Initial release"}],"status":"final","version":"1"}},"product_tree":{"branches":[{"name":"Palo Alto Networks","category":"vendor","branches":[]}]},"vulnerabilities":[{"cve":"CVE-2013-5663","product_status":{"fixed":["PANW-PAN-OS-493"],"known_affected":["PANW-PAN-OS-492"],"known_not_affected":["PANW-PAN-OS-494","PANW-PAN-OS-495"]},"notes":[{"category":"description","text":"An evasion technique that takes advantage of the App-ID cache function has recently been published. In certain circumstances, a knowledgeable user can bypass security policy that restricts the use of certain applications by sending numerous specially crafted requests over the network in order to poison the firewall’s App-ID cache.  This can result in the use of a blocked application for a period of time. If the App-ID cache pollution evasion technique is a potential problem for your network, we recommend using one or both of the mitigation steps noted below while we further enhance the App-ID cache feature to resist all possible pollution techniques.  (Ref #47195)\nThis issue affects the ability of the firewall to block certain applications when specially crafted requests are passed through the firewall.\nThis issue affects All versions of PAN-OS 5.0.1 and earlier."}],"references":[{"category":"external","summary":"NVD - CVE-2013-5663","url":"https://nvd.nist.gov/vuln/detail/CVE-2013-5663"},{"category":"self","summary":"Palo Alto Networks Security Advisory CVE-2013-5663","url":"https://security.paloaltonetworks.com/CVE-2013-5663"}],"threats":[{"category":"impact","description":"An evasion technique that takes advantage of the App-ID cache function has recently been published. In certain circumstances, a knowledgeable user can bypass security policy that restricts the use of certain applications by sending numerous specially crafted requests over the network in order to poison the firewall’s App-ID cache.  This can result in the use of a blocked application for a period of time. If the App-ID cache pollution evasion technique is a potential problem for your network, we recommend using one or both of the mitigation steps noted below while we further enhance the App-ID cache feature to resist all possible pollution techniques.  (Ref #47195)\nThis issue affects the ability of the firewall to block certain applications when specially crafted requests are passed through the firewall.\nThis issue affects All versions of PAN-OS 5.0.1 and earlier."}],"scores":[{"cvss_v3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"LOW","availabilityImpact":"NONE","baseScore":3.7,"baseSeverity":"LOW"},"products":["PANW-PAN-OS-492"]}]}]}