{ "document": { "acknowledgments": [ { "summary": "Cisco would like to thank Idan Less for reporting this vulnerability." } ], "category": "csaf_security_advisory", "csaf_version": "2.0", "notes": [ { "category": "summary", "title": "Summary", "text": "A vulnerability in the network driver of Cisco Terminal Service (TS) Agent could allow an authenticated, remote attacker to bypass firewall rules that are associated with the account of the attacker.\r\n\r\nThis vulnerability is due to an incorrect mapping of network connections to user accounts. An attacker with at least user-level credentials could exploit this vulnerability by sending crafted network traffic to an affected device. A successful exploit could allow the attacker to inherit the firewall rules associated with a different user in the system.\r\n\r\nCisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.\r\n\r\n" }, { "category": "general", "title": "Vulnerable Products", "text": "At the time of publication, this vulnerability affected Cisco TS Agent, regardless of device configuration.\r\n\r\nFor information about which Cisco software releases were vulnerable at the time of publication, see the Fixed Software [\"#fs\"] section of this advisory. See the Details section in the bug ID(s) at the top of this advisory for the most complete and current information." }, { "category": "general", "title": "Products Confirmed Not Vulnerable", "text": "Only products listed in the Vulnerable Products [\"#vp\"] section of this advisory are known to be affected by this vulnerability." }, { "category": "general", "title": "Workarounds", "text": "There are no workarounds that address this vulnerability." }, { "category": "general", "title": "Fixed Software", "text": "Cisco considers any workarounds and mitigations (if applicable) to be temporary solutions until an upgrade to a fixed software release is available. To fully remediate this vulnerability and avoid future exposure as described in this advisory, Cisco strongly recommends that customers upgrade to the fixed software indicated in this advisory.\r\n Fixed Releases\r\nAt the time of publication, the release information in the following table was accurate. See the Details section in the bug ID(s) at the top of this advisory for the most complete and current information.\r\n Cisco Terminal Services Agent Software Release First Fixed Release Earlier than 1.4.3 1.4.3\r\nThe Cisco Product Security Incident Response Team (PSIRT) validates only the affected and fixed release information that is documented in this advisory." }, { "category": "general", "title": "Vulnerability Policy", "text": "To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy [\"http://www.cisco.com/web/about/security/psirt/security_vulnerability_policy.html\"]. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.\r\n\r\nFor additional information on Cisco's vulnerability management, disclosure cadence, and software patching strategy, see Cisco's Transition to a Risk-Based Vulnerability Disclosure Model [\"https://sec.cloudapps.cisco.com/security/center/resources/risk-based-disclosure\"]." }, { "category": "general", "title": "Exploitation and Public Announcements", "text": "The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory." }, { "category": "general", "title": "Source", "text": "Cisco would like to thank Idan Less for reporting this vulnerability." }, { "category": "legal_disclaimer", "title": "Legal Disclaimer", "text": "SOFTWARE DOWNLOADS AND TECHNICAL SUPPORT\r\n\r\nThe Cisco Support and Downloads [\"https://www.cisco.com/c/en/us/support/index.html\"] page on Cisco.com provides information about licensing and downloads. This page can also display customer device support coverage for customers who use the My Devices tool. Please note that customers may download only software that was procured from Cisco directly or through a Cisco authorized reseller or partner and for which the license is still valid.\r\n\r\nCustomers who purchase directly from Cisco but do not hold a Cisco service contract and customers who make purchases through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should obtain upgrades by contacting the Cisco Technical Assistance Center (TAC) [\"https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html\"]. Customers should have the product serial number available and be prepared to provide the URL of this advisory as evidence of entitlement to a free upgrade.\r\n\r\nWhen considering software upgrades [\"https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html#fixes\"], customers are advised to regularly consult the advisories [\"https://www.cisco.com/go/psirt\"] for the relevant Cisco products to determine exposure and a complete upgrade solution. In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) [\"https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html\"] or their contracted maintenance providers.\r\nLEGAL DISCLAIMER DETAILS\r\n\r\nCISCO DOES NOT MAKE ANY EXPRESS OR IMPLIED GUARANTEES OR WARRANTIES OF ANY KIND, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. WITHOUT LIMITING THE GENERALITY OF THE FOREGOING, CISCO DOES NOT GUARANTEE THE ACCURACY OR COMPLETENESS OF THIS INFORMATION. THIS DOCUMENT IS PROVIDED ON AN \"AS IS\" BASIS. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.\r\n\r\nCopies or summaries of the information contained in this Security Advisory may lack important information or contain factual errors. Customers are advised to visit the Cisco Security Advisories [\"https://www.cisco.com/go/psirt\"] page for the most recent version of this Security Advisory. The Cisco Product Security Incident Response Team (PSIRT) assesses only the affected and fixed release information that is documented in this advisory. See the Cisco Security Vulnerability Policy [\"https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html#fixes\"] for more information." } ], "publisher": { "category": "vendor", "contact_details": "psirt@cisco.com", "issuing_authority": "Cisco PSIRT", "name": "Cisco", "namespace": "https://wwww.cisco.com" }, "references": [ { "category": "self", "summary": "Cisco Terminal Services Agent Firewall Rules Bypass Vulnerability", "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ts-agent-fw-bypass-MYBTMrev" }, { "category": "external", "summary": "Cisco Security Vulnerability Policy", "url": "https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html" }, { "category": "external", "summary": "Security Vulnerability Policy", "url": "http://www.cisco.com/web/about/security/psirt/security_vulnerability_policy.html" }, { "category": "external", "summary": "Cisco's Transition to a Risk-Based Vulnerability Disclosure Model", "url": "https://sec.cloudapps.cisco.com/security/center/resources/risk-based-disclosure" }, { "category": "external", "summary": "Cisco Support and Downloads", "url": "https://www.cisco.com/c/en/us/support/index.html" }, { "category": "external", "summary": "Cisco Technical Assistance Center (TAC)", "url": "https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html" }, { "category": "external", "summary": "considering software upgrades", "url": "https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html#fixes" }, { "category": "external", "summary": "the advisories", "url": "https://www.cisco.com/go/psirt" } ], "title": "Cisco Terminal Services Agent Firewall Rules Bypass Vulnerability", "tracking": { "current_release_date": "2026-08-05T16:00:00+00:00", "generator": { "date": "2026-08-08T01:30:12+00:00", "engine": { "name": "TVCE" } }, "id": "cisco-sa-ts-agent-fw-bypass-MYBTMrev", "initial_release_date": "2026-08-05T16:00:00+00:00", "revision_history": [ { "date": "2026-08-05T15:51:18+00:00", "number": "1.0.0", "summary": "Initial public release." } ], "status": "final", "version": "1.0.0" } }, "product_tree": { "branches": [ { "name": "Cisco", "category": "vendor", "branches": [ { "name": "Cisco Terminal Services Agent", "category": "product_family", "branches": [ { "name": "TSAgent.1", "category": "product_version", "branches": [ { "name": "TSAgent-1.0", "category": "service_pack", "product": { "name": "TSAgent-1.0", "product_id": "CSAFPID-308836" } }, { "name": "TSAgent-1.1", "category": "service_pack", "product": { "name": "TSAgent-1.1", "product_id": "CSAFPID-308837" } }, { "name": "TSAgent-1.2", "category": "service_pack", "product": { "name": "TSAgent-1.2", "product_id": "CSAFPID-308838" } }, { "name": "TSAgent-1.3", "category": "service_pack", "product": { "name": "TSAgent-1.3", "product_id": "CSAFPID-308839" } }, { "name": "TSAgent-1.4", "category": "service_pack", "product": { "name": "TSAgent-1.4", "product_id": "CSAFPID-308840" } }, { "name": "TSAgent-1.4.1", "category": "service_pack", "product": { "name": "TSAgent-1.4.1", "product_id": "CSAFPID-308841" } }, { "name": "TSAgent-1.4.2", "category": "service_pack", "product": { "name": "TSAgent-1.4.2", "product_id": "CSAFPID-308842" } } ] } ] }, { "name": "Cisco Terminal Services Agent", "category": "product_name", "product": { "name": "Cisco Terminal Services Agent", "product_id": "CSAFPID-308567" } } ] } ], "relationships": [ { "category": "installed_on", "full_product_name": { "name": "Cisco Terminal Services Agent TSAgent-1.0 when installed on Cisco Terminal Services Agent", "product_id": "CSAFPID-308836:308567" }, "product_reference": "CSAFPID-308836", "relates_to_product_reference": "CSAFPID-308567" }, { "category": "installed_on", "full_product_name": { "name": "Cisco Terminal Services Agent TSAgent-1.1 when installed on Cisco Terminal Services Agent", "product_id": "CSAFPID-308837:308567" }, "product_reference": "CSAFPID-308837", "relates_to_product_reference": "CSAFPID-308567" }, { "category": "installed_on", "full_product_name": { "name": "Cisco Terminal Services Agent TSAgent-1.2 when installed on Cisco Terminal Services Agent", "product_id": "CSAFPID-308838:308567" }, "product_reference": "CSAFPID-308838", "relates_to_product_reference": "CSAFPID-308567" }, { "category": "installed_on", "full_product_name": { "name": "Cisco Terminal Services Agent TSAgent-1.3 when installed on Cisco Terminal Services Agent", "product_id": "CSAFPID-308839:308567" }, "product_reference": "CSAFPID-308839", "relates_to_product_reference": "CSAFPID-308567" }, { "category": "installed_on", "full_product_name": { "name": "Cisco Terminal Services Agent TSAgent-1.4 when installed on Cisco Terminal Services Agent", "product_id": "CSAFPID-308840:308567" }, "product_reference": "CSAFPID-308840", "relates_to_product_reference": "CSAFPID-308567" }, { "category": "installed_on", "full_product_name": { "name": "Cisco Terminal Services Agent TSAgent-1.4.1 when installed on Cisco Terminal Services Agent", "product_id": "CSAFPID-308841:308567" }, "product_reference": "CSAFPID-308841", "relates_to_product_reference": "CSAFPID-308567" }, { "category": "installed_on", "full_product_name": { "name": "Cisco Terminal Services Agent TSAgent-1.4.2 when installed on Cisco Terminal Services Agent", "product_id": "CSAFPID-308842:308567" }, "product_reference": "CSAFPID-308842", "relates_to_product_reference": "CSAFPID-308567" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-20028", "ids": [ { "system_name": "Cisco Bug ID", "text": "CSCws82513" } ], "notes": [ { "category": "other", "title": "Affected Product Comprehensiveness", "text": "Complete." } ], "product_status": { "known_affected": [ "CSAFPID-308566", "CSAFPID-308836", "CSAFPID-308837", "CSAFPID-308838", "CSAFPID-308839", "CSAFPID-308840", "CSAFPID-308841", "CSAFPID-308842" ] }, "release_date": "2026-08-05T16:00:00+00:00", "remediations": [ { "category": "vendor_fix", "details": "Cisco has released software updates that address this vulnerability.", "product_ids": [ "CSAFPID-308566", "CSAFPID-308836", "CSAFPID-308837", "CSAFPID-308838", "CSAFPID-308839", "CSAFPID-308840", "CSAFPID-308841", "CSAFPID-308842" ], "url": "https://software.cisco.com" } ], "scores": [ { "cvss_v3": { "baseScore": 5.0, "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N", "version": "3.1" }, "products": [ "CSAFPID-308566", "CSAFPID-308836", "CSAFPID-308837", "CSAFPID-308838", "CSAFPID-308839", "CSAFPID-308840", "CSAFPID-308841", "CSAFPID-308842" ] } ], "title": "Cisco Terminal Services Agent Firewall Rules Bypass Vulnerability" } ] }