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ClamAV Vulnerabilities Affecting Cisco Products: August 2026

Cisco patched ClamAV vulnerabilities that allow remote attackers to cause denial-of-service conditions, rated High only for Windows-based platforms.

Cisco released an advisory covering multiple ClamAV vulnerabilities that could let a remote attacker interrupt scanning operations with a denial of service. Software updates are available for affected Cisco platforms, and no workarounds exist. The Security Impact Rating is High for Windows-based platforms because ClamAV runs there in a privileged security context.

Cisco Security Advisories · Aug 13, 2026Advisory

Cisco Advance Notification for Publication of September 16, 2026, Security Advisories

Cisco will publish security advisories with fixed software on September 16, 2026, covering BroadWorks, ISE, Nexus Dashboard, ASA, FMC, FTD and ThousandEyes.

Cisco PSIRT announced advance notification for security advisories to be published on September 16, 2026, along with fixed software releases. Affected products include BroadWorks CommPilot Application Software, Identity Services Engine (ISE), Nexus Dashboard, Secure Firewall ASA, Secure Firewall Management Center (FMC), Secure Firewall Threat Defense (FTD), and ThousandEyes Virtual Appliance. ISE, Nexus Dashboard and the Secure Firewall products receive security hardening releases, and the ASA, FMC and FTD advisories will be included in the same combined release.

Cisco Security Advisories · 7d agoAdvisory

Cisco security advisory (AV26-876)

Canada's Cyber Centre relayed Cisco advisories covering a Nexus 9000 Silicon One RCE, IOS XR hardening, and denial-of-service flaws across IP phone lines.

The Canadian Centre for Cyber Security advisory AV26-876 lists Cisco vulnerabilities affecting IOS XR, Nexus 9000 Series switches, and several IP phone series. Included are a Nexus 9000 Silicon One remote code execution vulnerability, a September 2026 IOS XR security hardening release, and SIP software denial-of-service flaws in Desk Phone 9800, IP Phone 7800/8800, and Video Phone 8875. The Cyber Centre urges users and administrators to review the Cisco advisories and apply updates as they become available. No active exploitation is reported in the advisory.

Canadian Centre for Cyber Security · 13d agoAdvisory

Cisco security advisory (AV26-921)

Canadian Cyber Centre warns actively exploited Cisco Secure Email Gateway SQL injection CVE-2026-76461 was added to CISA's KEV database.

The Canadian Centre for Cyber Security advisory AV26-921 (September 14, 2026) covers a SQL injection vulnerability in Cisco Secure Email Gateway (AsyncOS) and Secure Email and Web Manager. Affected versions include AsyncOS/Secure Email Gateway prior to 15.5.5-014, 16.0.4-302, and 16.5.0-780, and Secure Email and Web Manager prior to 15.5.5-006 and 16.5.0-429. Cisco stated CVE-2026-76461 is being actively exploited, and CISA added it to the Known Exploited Vulnerabilities database the same day. Users and administrators are urged to apply updates as they become available.

Canadian Centre for Cyber Securityupdated · 22h agofirst · 2d agoAdvisory in the wild 17 sourcesCVE-2026-76461

Cisco Advance Notification for Publication of September 2, 2026, Security Advisories

Cisco PSIRT published September 2, 2026 advisories including critical IOS XR hardening fixes and a Nexus 9000 remote code execution flaw.

Cisco's PSIRT released its September 2, 2026 batch of security advisories, including a Cisco IOS XR Software security hardening release bundling six CVEs (CVE-2026-20274 through CVE-2026-20280) rated critical with CVSS 9.8. A separate critical (CVSS 9.8) remote code execution vulnerability, CVE-2026-20212, affects Nexus 9000 Series switches with Silicon One, and a high-severity (CVSS 7.5) denial-of-service flaw, CVE-2026-20281, affects the Desk Phone 9800 Series and related SIP phones. Administrators should review the advisories and prioritize patching the critical-rated issues.

Cisco Security Advisories · 14d agoAdvisoryCVE-2026-20277CVE-2026-20278CVE-2026-20280+6 CVEs

Cisco Advance Notification for Publication of August 19, 2026, Security Advisories

Cisco PSIRT's advance notice previews August 19, 2026 advisories including Critical CVSS 10.0 hardening releases for Crosswork and Secure Workload.

Cisco PSIRT issued an advance notification for security advisories published August 19, 2026. The batch includes Critical-rated (CVSS 10.0) hardening releases for Cisco Crosswork and Cisco Secure Workload, a High-severity blind XML External Entity injection in BroadWorks (CVE-2026-20320, CVSS 7.5), a Medium SQL injection in Unified Intelligence Center (CVE-2026-20327, CVSS 6.5), and a RoomOS stack overflow. Full details and fixes follow in the individual advisories.

Cisco Security Advisories · 28d agoAdvisoryCVE-2026-20030CVE-2026-20357CVE-2026-20358+8 CVEs

Cisco Nexus Dashboard Software Security Hardening Release: September 2026

Cisco released Nexus Dashboard hardening updates for multiple internally discovered vulnerabilities, grouped by CWE and not known to be exploited.

Cisco's Nexus Dashboard engineering team conducted an internal security review that found multiple vulnerabilities, addressed via software hardening releases. The issues were discovered during internal testing and are not known to be actively exploited. Cisco grouped the issues by CWE class and assigned a single CVE ID per issue before releasing fixes.

Cisco Security Advisories · 20h agoAdvisory

Cisco Secure Firewall Adaptive Security Appliance, Secure Firewall Threat Defense, and Secure Firewall Management Center Software Hardening Release: September 2026

Cisco's September 2026 firewall hardening release fixes internally found ASA, FTD, and FMC flaws, two of which are actively exploited.

Cisco released September 2026 hardening updates for Secure Firewall ASA, FTD, and FMC software addressing multiple vulnerabilities discovered during a comprehensive internal security review. Two of the vulnerabilities are known to be actively exploited, including a Cisco Secure Firewall Management Center static credential vulnerability. Details are provided in separate linked advisories.

Cisco Security Advisories · 20h agoAdvisory in the wild 6 sources

Cisco Identity Services Engine Hardening Release: September 2026

Cisco ISE hardening release fixes multiple internally discovered vulnerabilities, including an authentication bypass known to be actively exploited.

Cisco released September 2026 hardening updates for Identity Services Engine (ISE) and ISE Passive Identity Connector (ISE-PIC) following a comprehensive internal security review that uncovered multiple vulnerabilities. One of the flaws, an ISE authentication bypass, is known to be actively exploited. Cisco grouped the issues by underlying vulnerability to help customers prioritize patching and streamline disclosure.

Cisco Security Advisoriesupdated · 1h agofirst · 20h agoAdvisory in the wild 21 sources

Cisco Secure Email Gateway and Secure Email and Web Manager Security Hardening Release: September 2026

Cisco's September 2026 hardening release for Secure Email Gateway and Secure Email and Web Manager patches internally found flaws, one actively exploited.

Cisco issued a security hardening release for Cisco Secure Email Gateway and Secure Email and Web Manager covering multiple internally discovered vulnerabilities, grouped by CWE class to streamline patching. Cisco states one of the vulnerabilities is known to be actively exploited. The exploited issue is the Cisco Secure Email Gateway SQL Injection Vulnerability detailed in a companion advisory. Software updates are available.

Cisco Security Advisories · 2d agoAdvisory in the wild6

Cisco IOS XR Software Security Hardening Release: September 2026

Cisco released IOS XR security hardening fixes for multiple internally discovered vulnerabilities, grouped by CWE class, with no known active exploitation.

Cisco's IOS XR engineering team conducted a comprehensive internal security review and released hardening updates addressing multiple internally discovered vulnerabilities. The issues were found during internal testing and are not known to be actively exploited. Cisco grouped the vulnerabilities by CWE class and assigned a single CVE ID to each grouping to streamline patching and disclosure.

Cisco Security Advisories · 12d agoAdvisory

Cisco Crosswork Security Hardening Release: August 2026

Cisco released an August 2026 Crosswork security hardening update addressing multiple internally discovered vulnerabilities, grouped by CWE class with one CVE per grouping.

Cisco's Crosswork engineering team completed a comprehensive internal security review and shipped a hardening release fixing multiple internally discovered vulnerabilities. The issues were found during internal testing, are grouped by CWE class, and each grouping received a single CVE ID. Cisco states these vulnerabilities are not known to be actively exploited.

Cisco Security Advisories · 26d agoAdvisory

Cisco Secure Workload Software Security Hardening Release: August 2026

Cisco shipped August 2026 hardening releases for Secure Workload fixing multiple internally discovered vulnerabilities that are not actively exploited.

Cisco's Secure Workload engineering team completed an internal security review that found multiple vulnerabilities during internal testing. The issues are grouped by CWE class with a single CVE assigned per grouping, and none are known to be actively exploited. Cisco has released hardening updates for customers to patch.

Cisco Security Advisories · 28d agoAdvisory

Microsoft Patch Tuesday for August 2026 — Snort rules and prominent vulnerabilities

Microsoft's August 2026 Patch Tuesday fixes 421 vulnerabilities across its products, including 62 rated critical; Cisco Talos published analysis and matching Snort rules.

Microsoft released its August 2026 monthly security update addressing 421 vulnerabilities across a range of products. Of these, 62 flaws were rated critical by Microsoft. Cisco Talos highlighted the most prominent vulnerabilities in the release and published Snort rules for detection of related exploitation attempts.

Cisco Talos · Aug 11, 2026Advisory

Oracle Patches 800+ Vulnerabilities in September 2026 Security Update

Oracle's September 2026 Critical Patch Update fixes 800+ vulnerabilities, including over 100 critical flaws and 240+ remotely exploitable without authentication.

Oracle released 673 new security patches in its September 2026 Critical Security Patch Update, resolving 672 unique CVEs across 17 risk matrices plus 130+ additional CVEs. More than 100 flaws are critical severity and over 240 are remotely exploitable without authentication. Oracle E-Business Suite received the largest batch with 159 patches, followed by Fusion Middleware (153, including 78 unauthenticated remote flaws) and Hyperion (102). Oracle reports no exploitation of these specific flaws but warns attackers routinely exploit unpatched Oracle products.

SecurityWeekupdated · 16h agofirst · 1d agoAdvisory 3 sources