No exploitation reportedFix available

CVE-2021-1443

No exploitation reported by the sources we read.

Published2021-03-24
WeaknessCWE-77 · CWE-78

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

A vulnerability in the web UI of Cisco IOS XE Software could allow an authenticated, remote attacker to execute arbitrary code with root privileges on the underlying operating system of an affected device. The vulnerability exists because the affected software improperly sanitizes values that are parsed from a specific configuration file. An attacker could exploit this vulnerability by tampering with a specific configuration file and then sending an API call. A successful exploit could allow the attacker to inject arbitrary code that would be executed on the underlying operating system of the affected device. To exploit this vulnerability, the attacker would need to have a privileged set of credentials to the device.

Timeline

dates in UTC

2021-03-2420:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-1443?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-1443?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Cisco ios xe

Branch	Affected	Fixed in	Source
16.9	= 16.9.1	no fix published	NVD
16.9	= 16.9.1a	no fix published	NVD
16.9	= 16.9.1b	no fix published	NVD
16.9	= 16.9.1c	no fix published	NVD
16.9	= 16.9.1d	no fix published	NVD
16.9	= 16.9.1s	no fix published	NVD
16.9	= 16.9.2	no fix published	NVD
16.9	= 16.9.2a	no fix published	NVD
16.9	= 16.9.2s	no fix published	NVD
16.9	= 16.9.3	no fix published	NVD
16.9	= 16.9.3a	no fix published	NVD
16.9	= 16.9.3h	no fix published	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

ICSA-21-110-02 CISA5 known affected
ICSA-21-110-02_Rockwell Automation Stratix Switches
Stratix 5400: Versions 15.2(7)E3 and earlier · Stratix 5700: Versions 15.2(7)E3 and earlier · Stratix 5410: Versions 15.2(7)E3 and earlier · +2 more

Full record on NVD

Fix

Vendor fix CISA ICSA-21-110-02 · 5 productsStratix 5800: Apply Version 17.04.01 or later. If possible, disable DECnet protocol completely or on select interfaces.
Mitigation from the vendor CISA ICSA-21-110-02 · 5 productsRockwell Automation encourages users of the affected Stratix devices to update to an available firmware revision that addresses the associated risk.
Mitigation from the vendor CISA ICSA-21-110-02 · 5 productsStratix 8300: Migrate to contemporary solution.
Mitigation from the vendor CISA ICSA-21-110-02 · 5 productsAll versions, including Stratix 8000, Stratix 5700, Stratix 5410, Stratix 5400: Confirm the least-privilege user principle is followed, and user account access to is only granted with a minimum number of rights as needed.
Mitigation from the vendor CISA ICSA-21-110-02 · 5 productsPlease see the Rockwell Automation security advisory for more detailed information.
Mitigation from the vendor CISA ICSA-21-110-02 · 5 productsWhere a fix is not yet available, users who are unable to update are directed towards the risk mitigation strategies provided below, and are encouraged, when possible, to apply general security guidelines to employ multiple strategies simultaneously.

Advisories and patches

tools.cisco.comVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

CISA-ADPSSVC decisionnone2024-11-08
OpenCVESSVC decisionnone—
CNACVSS 3.15.5read 2026-10-23
NVDCVSS 3.17.2read 2026-10-23
NVDCVSS 2.08.5read 2026-10-23
CNAweakness (CWE)CWE-77read 2026-10-23
NVDweakness (CWE)CWE-78read 2026-10-23
FIRST EPSSEPSS score2.3 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Published: 2021-03-24
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2021-1443?

Is CVE-2021-1443 actively exploited?

Active exploitation of CVE-2021-1443 has not been confirmed. Its EPSS score was 2.3% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-1443?

CVE-2021-1443 has a CVSS v3 base score of 7.2 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

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