CVE-2019-1833
mediumpriority · track · 24EPSS 0.017 · 77 %ileEURUUSEPSS · scored 2026-10-27
A vulnerability in the Secure Sockets Layer (SSL)/Transport Layer Security (TLS) protocol parser of Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to bypass configured policies. The vulnerability is due to improper parsing of specific attributes in a TLS packet header. An attacker could exploit this vulnerability by sending malicious TLS messages to the affected system. A successful exploit could allow the attacker to bypass the configured policies for the system, which could allow traffic to flow through without being inspected.
remediations
Vendor fix, mitigation, or workaround guidance, as published by each source.
A vendor fix is available.
- FixedCisco Secure Firewall Threat Defense (FTD) Softwarecisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (12)
Products and version ranges known to be affected.
- cisco secure firewall management center= 6.1.0nvdUScpe:2.3:a:cisco:secure_firewall_management_center:*:*:*:*:*:*:*:*
- cisco secure firewall management center= 6.2.0nvdUScpe:2.3:a:cisco:secure_firewall_management_center:*:*:*:*:*:*:*:*
- cisco secure firewall management center= 6.2.1nvdUScpe:2.3:a:cisco:secure_firewall_management_center:*:*:*:*:*:*:*:*
- cisco secure firewall management center= 6.2.2nvdUScpe:2.3:a:cisco:secure_firewall_management_center:*:*:*:*:*:*:*:*
- cisco secure firewall management center= 6.2.3nvdUScpe:2.3:a:cisco:secure_firewall_management_center:*:*:*:*:*:*:*:*
advisories (1)
Vendor and ecosystem advisories describing this.
- cisco-sa-20190515-ftd-ssltls-bypassCisco Firepower Threat Defense Software SSL/TLS Policy Bypass Vulnerability2019-05-15csaf · cisco_csafUS
A vulnerability in the Secure Sockets Layer (SSL)/Transport Layer Security (TLS) protocol parser of Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to bypass configured policies. The vulnerability is due to improper parsing of specific attributes in a TLS packet header. An attacker could exploit this vulnerability by sending malicious TLS messages to the affected system. A successful exploit could allow the attacker to bypass the configured policies for the system, which could allow traffic to flow through without being inspected. There are no workarounds that address this vulnerability.
also known as (4)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (12)
External citations — patches, advisories, analysis.
- http://www.cisco.com/cnnvd
- http://www.securityfocus.com/bid/108338cnnvd
- https://nvd.nist.gov/vuln/detail/CVE-2019-1833cnnvd
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190515-ftd-ssltls-bypasscnnvd
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190515-ftdde-poly-bypasscnnvd
- https://www.auscert.org.au/bulletins/81190cnnvd
- https://www.auscert.org.au/bulletins/ESB-2019.1778/cnnvd
- https://www.securityfocus.com/bid/108338cnnvd
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