Cisco Monuit de Impugnatoribus Exploitantibus Criticam Authenticationis Bypass in SD-WAN Manager

Impugnatores novum criticum defectum zero-day in Cisco Catalyst SD-WAN Manager explodunt, systemate quod societates ad administrandum suas retia Cisco SD-WAN utuntur, Cisco dixit in consilio die 30 Septembris.

Defectus, CVE-2026-76504, impugnatori remoto sine accessu ad login permittit ut API Manageris utatur ut usor admin. Versiones correctae praesto sunt, et nulla solutio est. Hic defectus CVSS punctum 9.8 ex 10 habet. In parte API Manageris quae sessiones login tractat consistit.

Manager male tractat encodationem URI in petitione HTTP. Petito artificiose confecta, ergo, regulam authenticationis bypassare potest quae accessum ad unam API terminum restringere intendit.

Impugnator nullas credentias necessarias habet, tantum facultatem mittendi illam petitionem ad API Manageris. Managers ad interrete exposita in periculo compromissionis sunt, secundum Cisco. Per default, usor admin munus netadmin tenet, quod omnia opera in apparatu perficere permittitur.

Cisco dixit suum Product Security Incident Response Team "conscium factum esse activae exploitationis huius vulnerabilitatis" in Septembri 2026. Defectus inventus est dum Centrum Technicae Auxilii (TAC) Cisco casum subsidii tractabat.

Consilium non dicit quot clientes impugnati sint, quando impugnationes coeperunt, quis eas perfecerit, aut quid impugnatores cum accessu fecerint.

Quis Necessarium Est Upgrade

Defectus afficit SD-WAN Manager sine respectu ad quomodo systema configuratum sit. Nullum aliud productum ut afflictum indicatur. Hae sunt primae versiones correctae pro singulis traminibus versionum:

Tramen versionis

Prima versio correcta

Antiquius quam 20.9

Migratio ad versionem correctam

20.9

20.9.10.1

20.12

20.12.8.2

20.15

20.15.6.1

20.18

20.18.4.1

26.1

26.1.2.1

26.2

26.2.1

CVE-2026-76504 separatum est a tribus defectibus Cisco SD-WAN antea correctis: CVE-2026-20182 in Maio, et CVE-2026-20245 et CVE-2026-20262 in Iunio.

Comparatio consiliorum ostendit versiones correctas pro illis defectibus omnes antiquiores esse quam illas in tabula supra. Itaque Manager nuper adhibitus pro correctionibus Maii vel Iunii adhuc hanc renovationem necessariam habet.

Tabula non indicat tramina versionum 20.10, 20.11, 20.13, 20.14, aut 20.16, quae consilium Cisco Maii indicavit. Consilium etiam non nominat Cisco SD-WAN Cloud-Pro aut Cisco SD-WAN pro Gubernatione (FedRAMP), duo genera deployment nominata in consiliis Maii et Iunii.

Cisco SD-WAN Cloud (Cisco Managed) iam in versione 20.15.605 correcta est, et clientes in ea nullam actionem capere debent. Usque ad upgrade Manager in loco, Cisco suadet accessum ad eum ex retibus non securis, sicut interrete, restringere. Ubi accessus interretis requiritur, tantum noti, fideles hospites intrare debent, et componentia control debent post firewall sedere.

Ambientes Cisco Catalyst SD-WAN Cloud Hosted iam hanc mitigationem in loco habent. Mitigatio in ambitu probationis functa est, secundum Cisco, quae clientes monet ut eius effectum in suis retibus aestiment antequam eam applicent.

Dux Cisco de SD-WAN firmando dicit interfaces administrativae, sicut portus 443, 22 et 830, non debent directe ad interrete exponi. Accessus HTTPS ad Manager solum ex hospite salti aut subretis administrationis venire debet.

Reprehensio Signorum Compromissionis

Signa compromissionis quae Cisco describit involvunt j_security_check, viam petitionis quam Manager ad sessiones basatas logins utitur. In exemplo Cisco, unus character illius viae URI-encoded est, dando /%6a_security_check, ubi %6a pro littera j stat.

Dua log files sunt loca ad quaerendum j_security_check entries ex ignotis aut non auctoritate IP inscriptionibus:

File: /var/log/nms/containers/service-proxy/serviceproxy-access.log

File: /var/log/nms/vmanage-server.log, praecipue entries pro usoribus quorum nomina cum viptela-reserved- incipiunt.

Nomina cum viptela-reserved- pertinent ad rationes servitii systematis reservatas.

Quisquis character in petitione encodari potest, ita %6a tantum exemplum est. Eadem entries etiam in operatione normali apparere possunt, et quaelibet correspondens debet contra activitatem normalem examinari ut falsa positiva vitentur.

Ad adiuvandum determinare an Manager compromissum sit, clientes possunt aperire casum Severitatis 3 cum Cisco TAC et includere CVE-2026-76504 in titulo. Cisco eos rogat ut petitionem admin-tech in Manager primo currant, ut output file recensendum sit.

Consilium nullam regulam detectionis includit et non dicit an upgrade impugnatorem qui iam accessum habet removet. Consilia Cisco pro defectu Maio et primo defectu Iunii dixerunt renovationem solam compromissionem confirmatam non solvere. Dixerunt clientibus ut file admin-tech colligerent antequam upgrade faciant.

CVE-2026-76504 sequitur seriem defectuum Cisco SD-WAN quae hoc anno ut exploitatum notata sunt. Usque ad diem 30 Septembris, catalogus Vulnerabilitatum Notarum Exploitatarum a U.S. Cybersecurity and Infrastructure Security Agency (CISA) octo defectus Cisco SD-WAN in 2026 additos indicavit.

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Vulnerabilitates Relatae

CVE-2026-76504 CVSS 9.8 CRITICAL Analyzed

CVE-2026-76504 - Cisco Catalyst SD-WAN Manager Hex Encoding Vulnerability - [Actively Exploited]

A vulnerability in the API session-based authentication management of Cisco Catalyst SD-WAN Manager could allow an unauthenticated, remote attacker to access an affected system with privileges of the admin user. This vulnerability is due to improper handling of URI encoding in an HTTP request, which allows the request to bypass an authentication rule that is intended to restrict access to a specific API endpoint. An attacker could exploit this vulnerability by sending a crafted HTTP request to the API of the affected system. A successful exploit could allow the attacker to bypass authentication and gain access to the API as the admin user.

CVE-2026-20262 CVSS 6.5 MEDIUM Analyzed

CVE-2026-20262 - Cisco Catalyst SD-WAN Manager Directory or Path Traversal Vulnerability - [Actively Exploited]

A vulnerability in the web UI of Cisco Catalyst SD-WAN Manager, formerly SD-WAN vManage, could allow an authenticated, remote attacker to create a file or overwrite any file on the filesystem of an affected system. This vulnerability exists because the affected software does not properly validate user-supplied input during a file upload process. An attacker could exploit this vulnerability by sending a crafted HTTP request to an affected API endpoint of the affected system. A successful exploit could allow the attacker to create or overwrite any file on the underlying operating system. This file could later be used to elevate to root. To exploit this vulnerability, the attacker must have valid credentials with at least a lower-privileged, single-task user account.

CVE-2026-20245 CVSS 7.8 HIGH Analyzed

CVE-2026-20245 - Cisco Catalyst SD-WAN Manager Improper Encoding or Escaping of Output Vulnerability - [Actively Exploited]

A vulnerability in the CLI of Cisco Catalyst SD-WAN Controller, formerly SD-WAN vSmart, Cisco Catalyst SD-WAN Manager, formerly SD-WAN vManage, and Cisco Catalyst SD-WAN Validator, formerly SD-WAN vBond, could allow an authenticated, local attacker to execute arbitrary commands as root by supplying a crafted file to the affected system. This vulnerability is due to insufficient validation of user-supplied input. An attacker could exploit this vulnerability by uploading a crafted file to the affected system. A successful exploit could allow the attacker to perform command injection attacks on an affected system and elevate their privileges as the root user. To exploit this vulnerability, the attacker must have netadmin privileges on the affected system. This would require valid credentials or exploitation of or . Cisco is not aware of successful exploitation by other methods. Cisco has observed limited cases where the exploitation of this bug resulted in a configuration change pushed to edge devices. Cisco recommends that customers upgrade to the fixed software that is documented in the that was published on May 14, 2026, and verify the configuration of the edge devices.

CVE-2026-20182 CVSS 10 CRITICAL Analyzed

CVE-2026-20182 - Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability - [Actively Exploited]

May 2026: This security advisory provides the details and fix information for a vulnerability that was discovered and fixed after the was disclosed in February 2026. This new advisory is for a new vulnerability in the control connection handshaking. The section of this advisory includes Show Control Connections guidance to help with system checks.  A vulnerability in the peering authentication in Cisco Catalyst SD-WAN Controller, formerly SD-WAN vSmart, Cisco Catalyst SD-WAN Manager, formerly SD-WAN vManage, and Cisco Catalyst SD-WAN Validator, formerly SD-WAN vBond, could allow an unauthenticated, remote attacker to bypass authentication and obtain administrative privileges on an affected system. This vulnerability exists because the peering authentication mechanism in an affected system is not working properly. An attacker could exploit this vulnerability by sending crafted requests to the affected system. A successful exploit could allow the attacker to log in to an affected Cisco Catalyst SD-WAN Controller as an internal, high-privileged, non-root user account. Using this account, the attacker could access NETCONF, which would then allow the attacker to manipulate network configuration for the SD-WAN fabric.

Cisco Monuit de Impugnatoribus Exploitantibus Criticam Authenticationis Bypass in SD-WAN Manager

Vulnerabilitates Relatae

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