How severe is CVE-2021-1392?

CVE-2021-1392 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-1392 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-1392?

CVE-2021-1392 primarily affects Cisco Ios. In total, 214 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-1392?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-1392 published?

CVE-2021-1392 was published on 2021-03-24 and last updated on 2026-06-17.

CVE-2021-1392

CVE-2021-1392 is a high-severity vulnerability in Cisco Ios with a CVSS 3.x base score of 7.8. 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-522.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v2: 2.1
EPSS exploit prediction: 0% (12th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-522
Affected product: Cisco Ios
Published: 2021-03-24
Last modified: 2026-06-17

Description

A vulnerability in the CLI command permissions of Cisco IOS and Cisco IOS XE Software could allow an authenticated, local attacker to retrieve the password for Common Industrial Protocol (CIP) and then remotely configure the device as an administrative user. This vulnerability exists because incorrect permissions are associated with the show cip security CLI command. An attacker could exploit this vulnerability by issuing the command to retrieve the password for CIP on an affected device. A successful exploit could allow the attacker to reconfigure the device.

Frequently asked questions

What is CVE-2021-1392?: A vulnerability in the CLI command permissions of Cisco IOS and Cisco IOS XE Software could allow an authenticated, local attacker to retrieve the password for Common Industrial Protocol (CIP) and then remotely configure the device as an administrative user. This vulnerability exists because incorrect permissions are associated with the show cip security CLI command. An attacker could exploit this vulnerability by issuing the command to retrieve the password for CIP on an affected device. A successful exploit could allow the attacker to reconfigure the device.
How severe is CVE-2021-1392?: CVE-2021-1392 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-1392 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-1392?: CVE-2021-1392 primarily affects Cisco Ios. In total, 214 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-1392?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-1392 published?: CVE-2021-1392 was published on 2021-03-24 and last updated on 2026-06-17.

References

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-XE-SAP-OPLbze68

Affected products (214)

cpe:2.3:o:cisco:ios:15.0\(1\)ey:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.0\(1\)ey1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.0\(1\)ey2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(3\)svs:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(3\)svt1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(1\)ey:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(2\)e:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(2\)e1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(2\)e2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(2\)e3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(2\)e4:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(2\)e5:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(2\)e5a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(2\)e5b:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(2\)e6:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(2\)e7:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(2\)e7b:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(2\)e8:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(2\)e9:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(2\)e10:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(2\)ea:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(2\)ea1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(2\)ea2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(2\)ea3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(2\)eb:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(2\)eb1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(2\)eb2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(2a\)e2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(2b\)e:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(3\)e1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(3\)e2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(3\)e3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(3\)e4:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(3\)e5:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(3\)ea:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(4\)e5a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(4\)ea:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(4\)ea1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(4\)ea2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(4\)ea3:*:*:*:*:*:*:*

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