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CVE-2019-8351

28
FAUCET Score

CVE-2019-8351 is a critical vulnerability affecting Heimdal Thor Agent versions prior to 2.5.173, where the software fails to properly validate X.509 certificates from TLS servers. This oversight allows remote attackers to spoof legitimate servers using crafted certificates, leading to the potential compromise of sensitive information. With a CVSS score of 9.1 (Critical), this vulnerability is easily exploitable over the network with low attack complexity, posing a high risk to confidentiality and integrity. While no active exploitation, public exploit code, or significant community discussion has been observed, the inherent risk remains high due to the nature of the flaw.

Impacted Technologies

VendorProductVersion(s)CPE
2.5.170CPE matchmatch criteria
cpe:2.3:a:heimdalsecurity:thor:2.5.170:rc:*:*:*:*:*:*
2.5.171CPE matchmatch criteria
cpe:2.3:a:heimdalsecurity:thor:2.5.171:*:*:*:*:*:*:*
2.5.172CPE matchmatch criteria
cpe:2.3:a:heimdalsecurity:thor:2.5.172:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

9.1CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
5.2
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.31%
Probability of exploitation in next 30 days
EPSS Percentile
67.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0131 is in the 54th percentile among its peer group of 36,829 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

support.heimdalsecurity.com / hc/en-us/articles/360001084158-Release-2-5-172-PROD-Update
Vendor Advisory