Tag Archives: zero-days

About 60% of exploits are published before the CVE. What does this mean for your cyber security strategy?

4 November 2018

Some days ago Cisco published a vulnerability CVE-2018-15454[1][2] in software running on their security products Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD). Cisco discovered the flaw while investigating a support case, in other words, the attackers used a zero-day exploit.

How frequent are zero-days? This question is not easy to answer because it takes some time until malicious activity is detected. However, we can compare the date an exploit is published in the Exploit Database[3] with the date the vulnerability is published in the NVD.

Figure 1. Exploit publication date relative to CVE publication date.

Figure 1. Exploit publication date relative to CVE publication date. Data: 2013 – 2017

Between 2013 and 2017 about 60% of the exploits were published before the CVE. With this, about 60% of the exploits are candidates for zero-day exploits.

Figure 2. Exploit publication date relative to CVE publication date details.

Figure 2. Exploit publication date relative to CVE publication date details. Data: 2013 – 2017

Figure 2 shows the details within 30 days prior and after the CVE was published.

This is no reason to panic. In general, this means that we should directly start the remediation process once an exploit is published. Do not waste time!

In addition, since remediation takes some time, it makes sense to invest in means enhancing the resilience of application systems. Expect the worst and be prepared.

Find out more in the following posts.

Have a great week.


  1. MITRE. NVD – CVE-2018-15454 [Internet]. 2018 [cited 2018 Nov 3]. Available from: https://nvd.nist.gov/vuln/detail/CVE-2018-15454
  2. Cisco Security. Cisco Adaptive Security Appliance Software and Cisco Firepower Threat Defense Software Denial of Service Vulnerability [Internet]. Cisco Security Advisory. 2018 [cited 2018 Nov 3]. Available from: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20181031-asaftd-sip-dos
  3. Offensive Security. Offensive Security’s Exploit Database Archive [Internet]. Exploit Database. [cited 2018 Nov 4]. Available from: https://www.exploit-db.com/
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