CVE-2020-3156

CVE-2020-3156 is a medium-severity vulnerability in Cisco Identity Services Engine with a CVSS 3.x base score of 6.1. 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-79.

Key facts

Description

A vulnerability in the logging component of Cisco Identity Services Engine could allow an unauthenticated remote attacker to conduct cross-site scripting attacks. The vulnerability is due to the improper validation of endpoint data stored in logs used by the web-based interface. An attacker could exploit this vulnerability by sending malicious endpoint data to the targeted system. An exploit could allow the attacker to execute arbitrary script code in the context of the affected interface or to access sensitive, browser-based information.

Frequently asked questions

What is CVE-2020-3156?
A vulnerability in the logging component of Cisco Identity Services Engine could allow an unauthenticated remote attacker to conduct cross-site scripting attacks. The vulnerability is due to the improper validation of endpoint data stored in logs used by the web-based interface. An attacker could exploit this vulnerability by sending malicious endpoint data to the targeted system. An exploit could allow the attacker to execute arbitrary script code in the context of the affected interface or to access sensitive, browser-based information.
How severe is CVE-2020-3156?
CVE-2020-3156 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2020-3156 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (60th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-3156?
CVE-2020-3156 primarily affects Cisco Identity Services Engine. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-3156?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-3156 published?
CVE-2020-3156 was published on 2020-02-19 and last updated on 2026-06-17.

References

Affected products (4)

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