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ReviewHigh

CVE-2019-1687

Cisco Cisco Adaptive Security Appliance (ASA) Software, adaptive security appliance software, asa 5505

A vulnerability in the TCP proxy functionality for Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the device to restart unexpectedly, resulting in a denial of service (DoS) condition. The vulnerability is due to an error in TCP-based packet inspection, which could cause the TCP packet to have an invalid Layer 2 (L2)-formatted header. An attacker could exploit this vulnerability by sending a crafted TCP packet sequence to the targeted device. A successful exploit could allow the attac...

CVSS
7.5
EPSS
2.90%
86.0% percentile
CISA KEV
Not listed
Published
2019.05.04
PRIORITY ASSESSMENT

Review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability2.90%
Technical severityCVSS 7.5

Vulnerability overview

A vulnerability in the TCP proxy functionality for Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the device to restart unexpectedly, resulting in a denial of service (DoS) condition. The vulnerability is due to an error in TCP-based packet inspection, which could cause the TCP packet to have an invalid Layer 2 (L2)-formatted header. An attacker could exploit this vulnerability by sending a crafted TCP packet sequence to the targeted device. A successful exploit could allow the attac...

Affected product and versions

Product
Cisco Cisco Adaptive Security Appliance (ASA) Software, adaptive security appliance software, asa 5505
Affected versions
>= unspecified < 9.4.4.34, >= unspecified < 9.8.4, >= unspecified < 9.9.2.50, >= 9.5 < 9.6.4.25, >= 9.7 < 9.8.4, >= 9.9 < 9.9.2.50, >= 9.10 < 9.10.1.17, >= 6.0.0 < 6.2.3.12, >= 6.3.0 < 6.3.0.3
Fixed versions
9.4.4.34, 9.6.4.25, 9.8.4, 9.9.2.50, 9.10.1.17, 6.2.3.12, 6.3.0.3

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Cisco Cisco Adaptive Security Appliance (ASA) Software, adaptive security appliance software, asa 5505 and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
CWE-20