UpHeron
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Servers and applications

CVE-2019-12677

A vulnerability in the Secure Sockets Layer (SSL) VPN feature of Cisco Adaptive Security Appliance (ASA) Software could allow an authenticated, remote attacker to cause a denial of service (DoS) condition that prevents the creation of new SSL/Transport Layer Security (TLS) connections to an affected device. The vulnerability is due to incorrect handling of Base64-encoded strings. An attacker…

Severity
Medium 6.5
Published
2 Oct 2019
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Fixed in
9.1.7.4, 9.2.4.8, 9.4.2.11, 9.5.2.5, 9.6.2
Exploit chance
1.5% in the next 30 daysHigher than 74% of CVEs. EPSS by FIRST, 10 Nov 2026
Sources
NVD

Affected software

SoftwareAffected versions
Cisco ASA and Firepower Threat DefenseServers and applications · cpe:o:cisco:adaptive_security_appliance_software
  • Every version before 9.1.7.4
  • From 9.2 before 9.2.4.8
  • From 9.4 before 9.4.2.11
  • From 9.5 before 9.5.2.5
  • From 9.6 before 9.6.2

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2019-12677
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2019-12677