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CVE-2020-3561

MEDIUMCVSS 4.7/10EPSS 1.28%

Last modified

CVE-2020-3561 is a medium-severity vulnerability rated 4.7/10 on the CVSS scale. A vulnerability in the Clientless SSL VPN (WebVPN) of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to inject arbitrary HTTP headers in the responses of the affected system. The vulnerability is due to improper input sanitization. EPSS estimates a 1.28% chance of exploitation in the next 30 days.

Description

A vulnerability in the Clientless SSL VPN (WebVPN) of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to inject arbitrary HTTP headers in the responses of the affected system. The vulnerability is due to improper input sanitization. An attacker could exploit this vulnerability by persuading a user of the interface to click a crafted link. A successful exploit could allow the attacker to conduct a CRLF injection attack, adding arbitrary HTTP headers in the responses of the system and redirecting the user to arbitrary websites.

Metrics

CVSS 3.1
4.7/10

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

CVSS 3.0
4.7/10

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N

EPSS Probability
1.28%

67.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
CiscoAdaptive Security Appliance< 9.6.4.35
CiscoSecure Firewall Threat Defense< 6.3.0.6
CiscoSecure Firewall Threat Defense>= 6.4.0, < 6.4.0.10
CiscoSecure Firewall Threat Defense>= 6.5.0, < 6.5.0.5
CiscoSecure Firewall Threat Defense>= 6.6.0, < 6.6.1
CiscoAdaptive Security Appliance Software>= 9.8.0, < 9.8.4.20
CiscoAdaptive Security Appliance Software>= 9.9.0, < 9.9.2.80
CiscoAdaptive Security Appliance Software>= 9.10.0, < 9.10.1.43
CiscoAdaptive Security Appliance Software>= 9.12.0, < 9.12.3.9
CiscoAdaptive Security Appliance Software>= 9.13.0, < 9.13.1.10
CiscoAdaptive Security Appliance Software>= 9.14.0, < 9.14.1.10

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2020-3561?
A vulnerability in the Clientless SSL VPN (WebVPN) of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to inject arbitrary HTTP headers in the responses of the affected system. The vulnerability is due to improper input sanitization. An attacker could exploit this vulnerability by persuading a user of the interface to click a crafted link. A successful exploit could allow the attacker to conduct a CRLF injection attack, adding arbitrary HTTP headers in the responses of the system and redirecting the user to arbitrary websites.
How severe is CVE-2020-3561?
CVE-2020-3561 has a CVSS score of 4.7/10 (MEDIUM severity). The EPSS model estimates a 1.28% probability of exploitation in the next 30 days.
How do I fix CVE-2020-3561?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST