CVE-2019-8351
CVE-2019-8351 is a critical-severity vulnerability in Heimdalsecurity Thor with a CVSS 3.x base score of 9.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-295.
Key facts
- Severity: Critical (CVSS 3.x base score 9.1)
- CVSS v2: 6.4
- EPSS exploit prediction: 1% (67th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-295
- Affected product: Heimdalsecurity Thor
- Published:
- Last modified:
Description
Heimdal Thor Agent 2.5.17x before 2.5.173 does not verify X.509 certificates from TLS servers, which allows remote attackers to spoof servers and obtain sensitive information via a crafted certificate.
Frequently asked questions
- What is CVE-2019-8351?
- Heimdal Thor Agent 2.5.17x before 2.5.173 does not verify X.509 certificates from TLS servers, which allows remote attackers to spoof servers and obtain sensitive information via a crafted certificate.
- How severe is CVE-2019-8351?
- CVE-2019-8351 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
- Is CVE-2019-8351 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (67th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2019-8351?
- CVE-2019-8351 primarily affects Heimdalsecurity Thor. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2019-8351?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
- When was CVE-2019-8351 published?
- CVE-2019-8351 was published on 2019-03-21 and last updated on 2026-06-17.
References
Affected products (3)
- cpe:2.3:a:heimdalsecurity:thor:2.5.170:rc:*:*:*:*:*:*
- cpe:2.3:a:heimdalsecurity:thor:2.5.171:*:*:*:*:*:*:*
- cpe:2.3:a:heimdalsecurity:thor:2.5.172:*:*:*:*:*:*:*
More vulnerabilities in Heimdalsecurity Thor
- CVE-2023-29486 — Critical (CVSS 9.8): An issue was discovered in Heimdal Thor agent versions 3.4.2 and before 3.7.0 on Windows, allows attackers to bypass…
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- CVE-2023-29487 — Critical (CVSS 9.1): An issue was discovered in Heimdal Thor agent versions 3.4.2 and before on Windows and 2.6.9 and before on macOS,…
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