CVE-2021-1132: A vulnerability in the API subsystem and in the web-management interface of Cisco Network Services Orches

This month

MEDIUM 5.3REMOTEDOWNGRADE

CVE-2021-1132 is a medium-severity flaw (CVSS 5.3) affecting network services orchestrator. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability in the API subsystem and in the web-management interface of Cisco Network Services Orchestrator (NSO) could allow an unauthenticated, remote attacker to access sensitive data. This vulnerability exists because the web-management interface and certain HTTP-based APIs do not properly validate user-supplied input. An attacker could exploit this vulnerability by sending a crafted HTTP request that contains directory traversal ch

Why this priority

Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.6% (top 24%)
CISA exploited list	No
Weakness	CWE-35
Published	2024-11-18
Last modified	2026-06-17

Publisher (CNA): Cisco Systems, Inc. · Vendor: cisco

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-11-18 16:15 UTCPublished CVE record published
2026-06-17 03:31 UTCUpdated Record last modified

cisco network services orchestrator DOWNGRADE

Affected: 5.3.1 · 5.4 · 5.4.0.1 · 5.4.0.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.3.1

1. Check installed version

apt-cache policy network-services-orchestrator || rpm -q network-services-orchestrator || network-services-orchestrator --version

2. No fixed release: DOWNGRADE to a release before 5.3.1 (Debian / Ubuntu)

apt-cache madison network-services-orchestrator sudo apt install network-services-orchestrator=<VERSION_BEFORE_5.3.1> sudo apt-mark hold network-services-orchestrator

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list network-services-orchestrator sudo dnf downgrade network-services-orchestrator-<VERSION_BEFORE_5.3.1> sudo dnf versionlock add network-services-orchestrator

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-1132?

network services orchestrator: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-1132 being exploited?

CVE-2021-1132 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-1132 affect?

CVE-2021-1132 affects network services orchestrator. Severity is medium (CVSS 5.3). A vulnerability in the API subsystem and in the web-management interface of Cisco Network Services Orchestrator (NSO) could allow an unauthenticated, remote attacker to access sensitive data. This vulnerability exists because the web-

How urgent is CVE-2021-1132?

Priority 43/100. Remotely exploitable, no login, no user action

Software pages

Cisco vulnerabilities

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References

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CVE-2021-1132: A vulnerability in the API subsystem and in the web-management interface of Cisco&nbsp;Network Services Orches