How severe is CVE-2021-1397?

CVE-2021-1397 has a CVSS 3.x base score of 4.7, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2021-1397 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-1397?

CVE-2021-1397 primarily affects Cisco Integrated Management Controller. In total, 25 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-1397?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-1397 published?

CVE-2021-1397 was published on 2021-05-06 and last updated on 2026-06-17.

CVE-2021-1397

CVE-2021-1397 is a medium-severity vulnerability in Cisco Integrated Management Controller with a CVSS 3.x base score of 4.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-601.

Key facts

Severity: Medium (CVSS 3.x base score 4.7)
CVSS v2: 5.8
EPSS exploit prediction: 1% (53rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-601
Affected product: Cisco Integrated Management Controller
Published: 2021-05-06
Last modified: 2026-06-17

Description

A vulnerability in the web-based management interface of Cisco Integrated Management Controller (IMC) Software could allow an unauthenticated, remote attacker to redirect a user to a malicious web page. This vulnerability is due to improper input validation of the parameters in an HTTP request. An attacker could exploit this vulnerability by persuading a user to click a crafted link. A successful exploit could allow the attacker to redirect a user to a malicious website. This vulnerability is known as an open redirect attack, which is used in phishing attacks to get users to visit malicious sites without their knowledge.

Frequently asked questions

What is CVE-2021-1397?: A vulnerability in the web-based management interface of Cisco Integrated Management Controller (IMC) Software could allow an unauthenticated, remote attacker to redirect a user to a malicious web page. This vulnerability is due to improper input validation of the parameters in an HTTP request. An attacker could exploit this vulnerability by persuading a user to click a crafted link. A successful exploit could allow the attacker to redirect a user to a malicious website. This vulnerability is known as an open redirect attack, which is used in phishing attacks to get users to visit malicious sites without their knowledge.
How severe is CVE-2021-1397?: CVE-2021-1397 has a CVSS 3.x base score of 4.7, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2021-1397 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-1397?: CVE-2021-1397 primarily affects Cisco Integrated Management Controller. In total, 25 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-1397?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-1397 published?: CVE-2021-1397 was published on 2021-05-06 and last updated on 2026-06-17.

References

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-imc-openred-zAYrU6d2

Affected products (25)

cpe:2.3:a:cisco:integrated_management_controller:*:*:*:*:*:*:*:*
cpe:2.3:a:cisco:ucs_manager:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:encs_5100_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:encs_5400_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:c220_m6_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:c225_m6_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:c240_m6_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:c245_m6_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:c125_m5_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:c220_m5_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:c240_m5_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:c480_m5_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:c480_ml_m5_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ucs-e140s_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ucs-e140d_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ucs-e160d_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ucs-e160s-m3_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ucs-e180d-m3_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ucs-e1120d-m3_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ucs-e140s-m2_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ucs-e180d-m2_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ucs-e140s-m1_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ucs-e140dp_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ucs-e160dp-m1_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ucs_s3260_firmware:*:*:*:*:*:*:*:*

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Other CWE-601 (Open Redirect) vulnerabilities

CVE-2018-3774 — Critical (CVSS 10.0): Incorrect parsing in url-parse <1.4.3 returns wrong hostname which leads to multiple vulnerabilities such as SSRF, Open…
CVE-2019-25282 — Critical (CVSS 9.8): V-SOL GPON/EPON OLT Platform v2.03 contains an open redirect vulnerability in the script that allows attackers to…
CVE-2020-36912 — Critical (CVSS 9.8): Plexus anblick Digital Signage Management 3.1.13 contains an open redirect vulnerability in the 'PantallaLogin' script…
CVE-2025-43526 — Critical (CVSS 9.8): This issue was addressed with improved URL validation. This issue is fixed in Safari 26.2, macOS Tahoe 26.2. On a Mac…
CVE-2025-55031 — Critical (CVSS 9.8): Malicious pages could use Firefox for iOS to pass FIDO: links to the OS and trigger the hybrid passkey transport. An…
CVE-2024-22891 — Critical (CVSS 9.8): Nteract v.0.28.0 was discovered to contain a remote code execution (RCE) vulnerability via the Markdown link.

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