How severe is CVE-2019-18850?

CVE-2019-18850 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2019-18850 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (64th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-18850?

CVE-2019-18850 primarily affects Trustedsec Trevorc2. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2019-18850?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2019-18850 published?

CVE-2019-18850 was published on 2019-12-04 and last updated on 2026-06-17.

CVE-2019-18850

CVE-2019-18850 is a high-severity vulnerability in Trustedsec Trevorc2 with a CVSS 3.x base score of 7.5. 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-203.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (64th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-203
Affected product: Trustedsec Trevorc2
Published: 2019-12-04
Last modified: 2026-06-17

Description

TrevorC2 v1.1/v1.2 fails to prevent fingerprinting primarily via a discrepancy between response headers when responding to different HTTP methods, also via predictible responses when accessing and interacting with the "SITE_PATH_QUERY".

Frequently asked questions

What is CVE-2019-18850?: TrevorC2 v1.1/v1.2 fails to prevent fingerprinting primarily via a discrepancy between response headers when responding to different HTTP methods, also via predictible responses when accessing and interacting with the "SITE_PATH_QUERY".
How severe is CVE-2019-18850?: CVE-2019-18850 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2019-18850 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (64th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-18850?: CVE-2019-18850 primarily affects Trustedsec Trevorc2. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2019-18850?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2019-18850 published?: CVE-2019-18850 was published on 2019-12-04 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:a:trustedsec:trevorc2:1.1:*:*:*:*:*:*:*
cpe:2.3:a:trustedsec:trevorc2:1.2:*:*:*:*:*:*:*

Other CWE-203 (Observable Discrepancy) vulnerabilities

CVE-2019-25337 — Critical (CVSS 9.8): OwnCloud 8.1.8 contains a username enumeration vulnerability that allows remote attackers to discover user accounts by…
CVE-2026-23519 — Critical (CVSS 9.8): RustCrypto CMOV provides conditional move CPU intrinsics which are guaranteed on major platforms to execute in…
CVE-2025-27667 — Critical (CVSS 9.8): Vasion Print (formerly PrinterLogic) before Virtual Appliance Host 22.0.843 Application 20.0.1923 allows Administrative…
CVE-2024-25714 — Critical (CVSS 9.8): In Rhonabwy through 1.1.13, HMAC signature verification uses a strcmp function that is vulnerable to side-channel…
CVE-2024-25191 — Critical (CVSS 9.8): php-jwt 1.0.0 uses strcmp (which is not constant time) to verify authentication, which makes it easier to bypass…
CVE-2024-25190 — Critical (CVSS 9.8): l8w8jwt 2.2.1 uses memcmp (which is not constant time) to verify authentication, which makes it easier to bypass…

Browse all CWE-203 (Observable Discrepancy) vulnerabilities →