CVE-2021-1399

Q: How do I fix CVE-2021-1399?

Upgrade unified communications manager to 12.5(1)su4 or later.

Q: Is CVE-2021-1399 being actively exploited?

Not that we know of. CVE-2021-1399 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.61% is the estimated probability that it will be exploited in the next 30 days. That is higher than 46% of all scored CVEs.

Q: How severe is CVE-2021-1399?

CVE-2021-1399 has a CVSS v3 base score of 4.3, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

Q: What does CVE-2021-1399 affect?

Published advisories record a fix for unified communications manager (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

MEDIUM

4.3

CVSS v3

NVD

Description

A vulnerability in the Self Care Portal of Cisco Unified Communications Manager (Unified CM) and Cisco Unified Communications Manager Session Management Edition (Unified CM SME) could allow an authenticated, remote attacker to modify data on an affected system without proper authorization. The vulnerability is due to insufficient validation of user-supplied data to the Self Care Portal. An attacker could exploit this vulnerability by sending a crafted HTTP request to an affected system. A successful exploit could allow the attacker to modify information without proper authorization.

CWE-302

How to fix

Remediation Available

unified communications managerNVD

Affected:>= 10.5(2), < 12.5(1)su4Fixed in:12.5(1)su4CVE-2021-1399derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityLow

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Exploit Intelligence

0.61%probability of exploitation in 30 days

46thpercentile

Moderate risk: more likely to be exploited than 46% of all known CVEs.

References

Vendor Advisory1

tools.cisco.com

Related Vulnerabilities

Other CWE-302 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-43441	Critical	9.8	70%	-	Fix
CVE-2024-4024	High	7.3	15%	-	Fix
CVE-2016-9482	Critical	9.8	4.7%	-	-
CVE-2025-29813	Critical	10.0	1.7%	-	-
CVE-2020-15074	High	7.5	1.0%	-	Fix
CVE-2024-49056	High	7.3	1.0%	-	-

Common questions

How do I fix CVE-2021-1399?

Upgrade unified communications manager to 12.5(1)su4 or later.

Is CVE-2021-1399 being actively exploited?

Not that we know of. CVE-2021-1399 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.61% is the estimated probability that it will be exploited in the next 30 days. That is higher than 46% of all scored CVEs.

How severe is CVE-2021-1399?

CVE-2021-1399 has a CVSS v3 base score of 4.3, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2021-1399 affect?

Published advisories record a fix for unified communications manager (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.