CVE Intelligence
Medium

CVE-2026-76497 — Cisco Expressway Series Software Hardening Release: October 2026 - Insecure Temporary File Vulnerabilities

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Expressway Series software engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities.   The vulnerabilities tracked by CVE-2026-76497 are related to issues concerning insecure temporary files that are grouped under the Common Weakness Enumeration (CWE) Base CWE-377.

Published Oct 21, 2026 · Updated Oct 22, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP, GitHub Security Advisories · CNA: cisco

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.
How the score was calculated
  • EPSS 0.2% (30-day exploitation probability)+1
  • Technical severity (medium)+3

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation
Not confirmed
Not in CISA KEV — an absence of record, not proof it is unexploited.
EPSS FIRST
0.16%
ahead of 5% of scored CVEs · Oct 29, 2026
Affects
Cisco
Cisco TelePresence Video Communication Server (VCS) Expressway
CVSS base
6.6
Medium · 3 source(s)

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Exploitation
None
none · proof-of-concept · active
Automatable
No
can an attacker script the kill-chain steps
Technical impact
Partial
partial · total control of the vulnerable component

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

  1. Identify exposed assets running the affected vendor/product/version combinations (Cisco Cisco TelePresence Video Communication Server (VCS) Expressway).
  2. No fix documented in the sources: reduce exposure and monitor the vendor advisory.
  3. Exploitation requires user interaction: tighten email/web filtering and warn affected users.
  4. Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

VendorProductVersionsStatusSource
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway version X14.2.0version X14.3.2version X14.3.1version X14.3.0version X14.2.7version X14.2.6version X14.0.10version X14.2.5
and 86 more version X14.0.11version X14.2.2version X14.2.1version X14.0.9version X14.3.3version X14.0.8version X14.0.7version X14.0.6version X14.0.5version X14.0.4version X14.0.3version X14.0.2version X14.0.1version X14.0.0version X12.7.1version X12.7.0version X15.2.3version X15.5.3version X15.5.2version X15.5.1version X15.5.0version X15.4.0version X15.3.2version X15.3.1version X15.3.0version X15.2.4version X15.2.4.version X14.3.7version X12.6.4version X15.2.2version X15.2.1version X15.2.0version X14.3.6version X15.0.3version X15.0.2version X15.0.1version X14.3.5version X14.3.4version X15.0.0version X12.6.0version X8.8.1version X12.5.4version X8.11.4version X8.9.2version X8.1version X8.5.3version X8.8.2version X8.10.2version X8.9.1version X8.5version X8.11.1version X8.2.1version X8.7.3version X12.5.6version X12.5.1version X8.9version X8.1.1version X12.5.2version X8.11.0version X8.8.3version X8.2.2version X8.11.3version X8.6version X8.2version X12.6.3version X12.6.2version X12.6.1version X12.5.5version X8.7.2version X8.10.4version X12.5.0version X12.5.9version X8.5.2version X8.7version X12.5.8version X8.11.2version X8.7.1version X8.10.3version X12.5.7version X8.10.1version X12.5.3version X8.10.0version X8.8version X8.1.2version X8.6.1version X8.5.1
Vulnerable CVE Program (cve.org) e CISA ADP

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
High

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

ScoreVersionSeverityExpl.ImpactScored by
6.6 CVSS 3.1 Medium 1.3 5.2 psirt@cisco.com via NIST National Vulnerability Database
6.6 CVSS 3.1 Medium — — GitHub, Inc. via GitHub Security Advisories
6.6 CVSS 3.1 Medium — — cisco via CVE Program (cve.org) e CISA ADP
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:H (score shown at the top: psirt@cisco.com)

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-377

Other CVEs with this weakness →

EPSS over time FIRST

Oct 22, 2026 → Oct 29, 2026 · 8 reading(s) · max 0.16%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

  • Local/physical vector: focus on endpoint telemetry (EDR) from affected hosts.
endpoint telemetry (EDR)

Timeline

What happened to this CVE, newest first.

  • 2026
  • SSVC assessment updated
    Oct 22, 2026 · CVE Program (cve.org) e CISA ADP
  • Source status changed · Received → Awaiting Analysis
    Oct 21, 2026 · NIST National Vulnerability Database
  • Affected products added · cisco/cisco telepresence video communication server (vcs) expressway
    Oct 21, 2026 · CVE Program (cve.org) e CISA ADP
  • Record published
    Oct 21, 2026
  • CVSS changed · 6.6
    Oct 21, 2026 · NIST National Vulnerability Database
  • Source status changed · → Received
    Oct 21, 2026 · NIST National Vulnerability Database
  • Record created in this database
    Oct 21, 2026 · Alertas do Telegram
  • CVE published
    Oct 21, 2026 · cisco

Source activity

Repeated readings are counted rather than listed.

  • 2× References added · Oct 21, 2026 – Oct 22, 2026
  • 1× Official description updated · Oct 21, 2026 – Oct 21, 2026

References

3 on the record

Elsewhere on this site

Cisco
every CVE for this vendor
CWE-377
other pages naming this weakness

Related CVEs (same products)

  • CVE-2026-76495 Cisco Expressway Series Software Hardening Release: October 2026 - Incorrect Permission Assignment Vulnerabilities 8d
  • CVE-2026-76496 Cisco Expressway Series Software Hardening Release: October 2026 - Improper Link Resolution Vulnerabilities 8d
  • CVE-2026-76491 Cisco Expressway Series Software Hardening Release: October 2026 - Denial of Service Vulnerabilities 8d
  • CVE-2026-76492 Cisco Expressway Series Software Hardening Release: October 2026 - NULL Pointer Vulnerabilities 8d
  • CVE-2026-76493 Cisco Expressway Series Software Hardening Release: October 2026 - Uncaught Exception Vulnerabilities 8d
  • CVE-2026-76494 Cisco Expressway Series Software Hardening Release: October 2026 - Code Injection Vulnerabilities 8d

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

  • No fixed version, patch or mitigation documented.
  • No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
  • No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
  • No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-76497 is "Cisco Expressway Series Software Hardening Release: October 2026 - Insecure Temporary File Vulnerabilities", rated Medium. It affects Cisco TelePresence Video Communication Server (VCS) Expressway (Cisco); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 6.6 describes technical severity. EPSS 0.16% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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