How severe is CVE-2017-16639?

CVE-2017-16639 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2017-16639 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-16639?

CVE-2017-16639 affects Torproject Tor Browser. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2017-16639?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2017-16639 published?

CVE-2017-16639 was published on 2018-09-14 and last updated on 2026-06-17.

CVE-2017-16639

CVE-2017-16639 is a medium-severity vulnerability in Torproject Tor Browser with a CVSS 3.x base score of 4.3. 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-200.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
CVSS v2: 4.3
EPSS exploit prediction: 2% (82nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-200
Affected product: Torproject Tor Browser
Published: 2018-09-14
Last modified: 2026-06-17

Description

Tor Browser on Windows before 8.0 allows remote attackers to bypass the intended anonymity feature and discover a client IP address, a different vulnerability than CVE-2017-16541. User interaction is required to trigger this vulnerability.

Frequently asked questions

What is CVE-2017-16639?: Tor Browser on Windows before 8.0 allows remote attackers to bypass the intended anonymity feature and discover a client IP address, a different vulnerability than CVE-2017-16541. User interaction is required to trigger this vulnerability.
How severe is CVE-2017-16639?: CVE-2017-16639 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2017-16639 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-16639?: CVE-2017-16639 affects Torproject Tor Browser. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2017-16639?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2017-16639 published?: CVE-2017-16639 was published on 2018-09-14 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:torproject:tor_browser:*:*:*:*:*:*:*:*

More vulnerabilities in Torproject Tor Browser

CVE-2018-16983 — Critical (CVSS 9.8): NoScript Classic before 5.1.8.7, as used in Tor Browser 7.x and other products, allows attackers to bypass script…
CVE-2021-39246 — Medium (CVSS 6.1): Tor Browser through 10.5.6 and 11.x through 11.0a4 allows a correlation attack that can compromise the privacy of…
CVE-2019-13075 — Medium (CVSS 5.3): Tor Browser through 8.5.3 has an information exposure vulnerability. It allows remote attackers to detect the browser's…
CVE-2019-12383 — Medium (CVSS 4.3): Tor Browser before 8.0.1 has an information exposure vulnerability. It allows remote attackers to detect the browser's…

All CVEs affecting Torproject Tor Browser →

Other CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor) vulnerabilities

CVE-2026-27604 — Critical (CVSS 10.0): FOSSBilling is a free, open-source billing and client management system. Starting in version 0.5.4 and prior to version…
CVE-2026-40965 — Critical (CVSS 10.0): Cloud Foundry UAA versions v76.12.0 through v78.12.0 are vulnerable to a private key exposure. The server contains a…
CVE-2026-42826 — Critical (CVSS 10.0): Exposure of sensitive information to an unauthorized actor in Azure DevOps allows an unauthorized attacker to disclose…
CVE-2025-29270 — Critical (CVSS 10.0): Incorrect access control in the realtime.cgi endpoint of Deep Sea Electronics devices DSE855 v1.1.0 to v1.1.26 allows…
CVE-2025-61481 — Critical (CVSS 10.0): An issue in MikroTik RouterOS v.7.14.2 and SwOS v.2.18 exposes the WebFig management interface over cleartext HTTP by…
CVE-2025-53624 — Critical (CVSS 10.0): The Docusaurus gists plugin adds a page to your Docusaurus instance, displaying all public gists of a GitHub user.…

Browse all CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor) vulnerabilities →