CVE-2021-1452
No exploitation reported by the sources we read.
- Published2021-03-24
- WeaknessCWE-78
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « 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 ROM Monitor (ROMMON) of Cisco IOS XE Software for Cisco Catalyst IE3200, IE3300, and IE3400 Rugged Series Switches, Cisco Catalyst IE3400 Heavy Duty Series Switches, and Cisco Embedded Services 3300 Series Switches could allow an unauthenticated, physical attacker to execute unsigned code at system boot time. This vulnerability is due to incorrect validations of specific function arguments passed to a boot script when specific ROMMON variables are set. An attacker could exploit this vulnerability by setting malicious values for a specific ROMMON variable. A successful exploit could allow the attacker to execute unsigned code and bypass the image verification check during the secure boot process of an affected device. To exploit this vulnerability, the attacker would need to have unauthenticated, physical access to the device or obtain privileged access to the root shell on the device.
Timeline
dates in UTC- 2021-03-2420:15CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-23 21:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-1452?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-1452?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 7.0 | ≤ 7.0 | 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_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
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 ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:P/AC:L/PR:N/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-2021-1452?
Is CVE-2021-1452 actively exploited?
What is the CVSS score for CVE-2021-1452?
Hear about the next vulnerability in your software
Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».
No credit card required · No monthly cap on website lookups · 250 API requests/month
Go further
- Following what attackers exploit right now? The CISA KEV additions of the month, with their patch deadlines.
- Running this software? Vulnerability monitoring alerts you to new vulnerabilities in your products.
Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.