Security readout for executives and security teams
Plain-English summary
Cisco Security Manager contains Java deserialization flaws that can let an unauthenticated remote attacker run commands on the Windows host. Successful exploitation runs with NT AUTHORITY\SYSTEM privileges, giving full host-level control. Cisco had not released software updates in the provided sources.
Executive priority
Treat this as high priority for any environment still running Cisco Security Manager. The business concern is full administrative compromise of a security management host, especially if reachable beyond a tightly controlled admin network.
Technical view
The issue is insecure deserialization of user-supplied content in Cisco Security Manager. An attacker can send a malicious serialized Java object to a specific listener. CVSS v3.1 is 8.1 with network access, no privileges, no user interaction, high impact, and high attack complexity.
Likely exposure
Exposure is most likely where Cisco Security Manager is deployed and its relevant listener or management network path is reachable by untrusted networks. The bundle does not identify exact affected versions or CPEs.
Exploitation context
The source bundle does not show CISA KEV listing or confirmed active exploitation. The attack is remote and unauthenticated but rated high complexity. Successful exploitation could provide SYSTEM-level command execution on the Windows host.
Researcher notes
Core evidence is strong for unauthenticated remote command execution via Java deserialization, but the bundle lacks exact affected version ranges and does not provide confirmed exploitation. Avoid assuming patch availability because the provided description says Cisco had not released updates.
Mitigation direction
- Check Cisco advisory guidance for current fixes, workarounds, or migration direction.
- Restrict network access to Cisco Security Manager listeners and management interfaces.
- Place Cisco Security Manager on a trusted administrative network only.
- Increase monitoring for unexpected process execution on the Windows host.
- Prioritize replacement or compensating controls if no vendor update is available.
Validation and detection
- Inventory all Cisco Security Manager deployments and hosting Windows systems.
- Confirm whether the relevant listener is reachable from untrusted networks.
- Review Cisco advisory applicability against installed product details.
- Check endpoint and network logs for suspicious connections or command execution.
- Document compensating controls where no vendor patch is available.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
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ATT&CK lookup starting points
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Open ATT&CK lookupCVE-2020-27131 mapping review
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Open ATT&CK lookup- Severity
- High
- CVSS
- 8.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H2.25.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.1HighVector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- 20201116 Cisco Security Manager Java Deserialization VulnerabilitiesCVE reference · vendor-advisory, x_refsource_CISCO
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Input Validation
Improper Input Validation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.