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CVE-2019-1687

25
FAUCET Score

CVE-2019-1687 is a denial-of-service vulnerability affecting Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software due to an error in TCP-based packet inspection. An unauthenticated, remote attacker can exploit this by sending a crafted TCP packet sequence, causing the device to unexpectedly restart. This vulnerability has a CVSS score of 7.5 (HIGH), indicating a network-based attack with low complexity and high impact on availability. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 9.4.4.34CPE matchmatch criteria
cpe:2.3:a:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*
>= 9.5, < 9.6.4.25CPE matchmatch criteria
cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*
>= 9.7, < 9.8.4CPE matchmatch criteria
cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*
>= 9.9, < 9.9.2.50CPE matchmatch criteria
cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*
>= 9.10, < 9.10.1.17CPE matchmatch criteria
cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

6.8MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
2.2
Impact Score
4.0
CvssVersion
3.0

Exploit Intelligence

EPSS Score
2.90%
Probability of exploitation in next 30 days
EPSS Percentile
85.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0290 is in the 74th percentile among its peer group of 51,553 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (1)

ciscovendor investigatingvia nvd_reference
View patch

References

tools.cisco.com / security/center/content/CiscoSecurityAdvisory/cisco-sa-20190501-asa-ftdtcp-dos
Vendor Advisory
securityfocus.com / bid/108176
Broken LinkThird Party AdvisoryVDB Entry