{"id":60810,"date":"2026-06-05T17:27:42","date_gmt":"2026-06-05T17:27:42","guid":{"rendered":"https:\/\/www.theregister.com\/a\/5251855"},"modified":"2026-06-05T17:27:42","modified_gmt":"2026-06-05T17:27:42","slug":"yet-another-cisco-sd-wan-0-day-under-attack-and-no-patch-in-sight","status":"publish","type":"post","link":"https:\/\/www.threatshub.org\/blog\/yet-another-cisco-sd-wan-0-day-under-attack-and-no-patch-in-sight\/","title":{"rendered":"Yet another Cisco SD-WAN 0-day under attack, and no patch in sight"},"content":{"rendered":"<div><img decoding=\"async\" src=\"https:\/\/image.theregister.com\/4094206.jpg?imageId=4094206&amp;x=0&amp;y=0&amp;cropw=100&amp;croph=100&amp;panox=0&amp;panoy=0&amp;panow=100&amp;panoh=100&amp;width=1200&amp;height=683\" class=\"ff-og-image-inserted\"><\/div>\n<div data-element-guid=\"d11159dd-82a3-4c53-901c-d41dec75505c\" readability=\"28.527607361963\">\n<p class=\"kicker \">security<\/p>\n<p class=\"subtitle \">Good luck, sys admins<\/p>\n<\/p><\/div>\n<div data-element-guid=\"4c9dc5d9-c886-4348-bf4a-01d0dc71377d\" readability=\"112.46956992156\">\n<p>The threat is real. Unknown miscreants are exploiting a high-severity, zero-day bug in Cisco\u2019s SD-WAN management software, and the networking giant hasn\u2019t said when it will patch the flaw.<\/p>\n<p>Cisco&nbsp;<a href=\"https:\/\/sec.cloudapps.cisco.com\/security\/center\/content\/CiscoSecurityAdvisory\/cisco-sa-sdwan-privesc-4uxFrdzx\" rel=\"nofollow\">issued an advisory<\/a> on Thursday for the Catalyst SD-WAN Manager vulnerability, tracked as CVE-2026-20245, and it sounds like attackers have been exploiting this security failure for at least the last week.<\/p>\n<p>It\u2019s due to a validation error &#8211; the software fails to properly validate user-supplied input &#8211; and an authenticated, local attacker can exploit the flaw by uploading a specially crafted file to vulnerable systems. From there, they can escalate privileges and execute commands with root privileges.<\/p>\n<p>The vulnerability affects all versions of the SD-WAN software, regardless of device configuration, and across all deployment types including on-premises, cloud-based, and FedRAMP-certified deployments.<\/p>\n<p>Switchzilla says it became aware of attacks against this vulnerability in June.<\/p>\n<p>\u201cTo exploit this vulnerability, an attacker must have netadmin privileges on an affected system,\u201d the vendor said. \u201cThis would require valid credentials or exploitation of <a href=\"https:\/\/sec.cloudapps.cisco.com\/security\/center\/content\/CiscoSecurityAdvisory\/cisco-sa-sdwan-rpa2-v69WY2SW\" rel=\"nofollow\">CVE-2026-20182<\/a> or <a href=\"https:\/\/sec.cloudapps.cisco.com\/security\/center\/content\/CiscoSecurityAdvisory\/cisco-sa-sdwan-rpa-EHchtZk\" rel=\"nofollow\">CVE-2026-20127<\/a>. Cisco is not aware of successful exploitation by other methods.\u201d <\/p>\n<p>Both of these earlier SD-WAN security holes have also been hit by attackers in previous months.<\/p>\n<p>The good news: an attacker needs valid credentials to abuse the new hole. The bad news: exposed credentials aren\u2019t hard to find (or buy) online.<\/p>\n<p>We don\u2019t know the scope of exploitation or exactly when attackers began hitting this SD-WAN hole. Cisco declined to answer <span class=\"italic m-italic \" data-lab-italic=\"italic\">The Register\u2019s<\/span> questions, and instead sent us a statement via email.<\/p>\n<p>\u201cCisco recommends customers upgrade to the fixed software released in May 2026 for CVE-2026-20182 as a protective measure,\u201d a spokesperson said. \u201cA patch for this vulnerability will be provided on a future date. Customers needing assistance should contact Cisco TAC.\u201d<\/p>\n<p>This latest bug is the sixth SD-WAN vulnerability listed as under attack since the start of the year, and the second zero-day in two months.<\/p>\n<p>The most recent is the one the Cisco spokesperson mentioned in an email to <span class=\"italic m-italic \" data-lab-italic=\"italic\">The Register<\/span>. <\/p>\n<p>In May, <a href=\"https:\/\/www.theregister.com\/patches\/2026\/05\/15\/cisco-discloses-yet-another-sd-wan-make-me-admin-0-day\/5241071\">Switchzilla disclosed<\/a> a max-severity make-me-admin bug (CVE-2026-20182) affecting Catalyst SD-WAN Controller and Manager, and warned that attackers had already found and exploited the hole before it issued a patch.<\/p>\n<p>A month earlier, America&#8217;s lead cyber-defense agency <a href=\"https:\/\/www.theregister.com\/security\/2026\/04\/21\/more-cisco-sd-wan-bugs-battered-in-attacks\/5229107\">said<\/a> that three Cisco Catalyst SD-WAN Manager bugs (<a href=\"https:\/\/www.cve.org\/CVERecord?id=CVE-2026-20128\" rel=\"nofollow\">CVE-2026-20128<\/a>, <a href=\"https:\/\/www.cve.org\/CVERecord?id=CVE-2026-20133\" rel=\"nofollow\">CVE-2026-20133<\/a>, and <a href=\"https:\/\/www.cve.org\/CVERecord?id=CVE-2026-20122\" rel=\"nofollow\">CVE-2026-20122<\/a>) were under attack, and gave federal agencies just four days to patch the security holes.<\/p>\n<p><a href=\"https:\/\/sec.cloudapps.cisco.com\/security\/center\/content\/CiscoSecurityAdvisory\/cisco-sa-sdwan-authbp-qwCX8D4v#\" rel=\"nofollow\">Cisco fixed<\/a>&nbsp;all three CVEs in late February, and in March <a href=\"https:\/\/www.theregister.com\/2026\/03\/06\/cisco_sdwan_bugs\/\">warned of attackers<\/a> abusing two of them. <\/p>\n<p>Also in February, the networking vendor patched a max-severity improper authentication flaw (<a href=\"https:\/\/www.cve.org\/CVERecord?id=CVE-2026-20127\" rel=\"nofollow\">CVE-2026-20127<\/a>) affecting the same SD-WAN software, prompting a <a href=\"https:\/\/www.theregister.com\/on-prem\/2026\/02\/26\/five-eyes-urge-action-as-cisco-zero-day-attacks-uncovered\/4493149\">Five Eyes countries\u2019 joint intelligence alert<\/a> urgently warning defenders to patch it &#8211; plus an old SD-WAN vulnerability (<a href=\"https:\/\/www.cve.org\/CVERecord?id=CVE-2022-20775\" rel=\"nofollow\">CVE-2022-20775<\/a>) &#8211; or risk root takeover.&nbsp;<\/p>\n<p>&#8220;Malicious cyber threat actors are targeting Cisco Catalyst SD-WAN used by organizations globally,&#8221; the UK&#8217;s lead cyber agency said at the time. &#8220;These actors are compromising SD-WANs to add a malicious rogue peer and then conduct a range of follow-on actions to achieve root access and maintain persistent access to the SD-WAN.&#8221;<\/p>\n<p>And while this one isn&#8217;t listed as under active exploitation (yet), on Wednesday, Cisco warned about a proof-of-concept exploit for <a href=\"https:\/\/sec.cloudapps.cisco.com\/security\/center\/content\/CiscoSecurityAdvisory\/cisco-sa-cucm-ssrf-cXPnHcW\" rel=\"nofollow\">CVE-2026-20230<\/a>, a critical bug in its Unified Communications Manager that also allows attackers to gain root privileges. \u00ae<\/p>\n<\/p><\/div>\n<p><img decoding=\"async\" src=\"https:\/\/image.theregister.com\/?imageId=4094206&#038;width=800\">READ MORE <a href=\"https:\/\/www.theregister.com\/security\/2026\/06\/05\/yet-another-cisco-sd-wan-0-day-under-attack-and-no-patch-in-sight\/5251855\">HERE<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p> Good luck, sys admins READ MORE HERE&#8230;<\/p>\n","protected":false},"author":2,"featured_media":60811,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_layout":"default_layout","footnotes":""},"categories":[63],"tags":[307],"class_list":["post-60810","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-the-register","tag-security"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Yet another Cisco SD-WAN 0-day under attack, and no patch in sight 2026 | ThreatsHub Cybersecurity News<\/title>\n<meta name=\"description\" content=\"ThreatsHub Cybersecurity News | ThreatsHub.org | Cloud Security &amp; Cyber Threats Analysis Hub. 100% Free OSINT Threat Intelligent and Cybersecurity News.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link 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