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CVE-2015-2689

HIGHCVSS 7.5/10EPSS 2.19%

Last modified

CVE-2015-2689 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Tor before 0.2.4.26 and 0.2.5.x before 0.2.5.11 does not properly handle pending-connection resolve states during periods of high DNS load, which allows remote attackers to cause a denial of service (assertion failure and daemon exit) via crafted packets.. EPSS estimates a 2.19% chance of exploitation in the next 30 days.

Description

Tor before 0.2.4.26 and 0.2.5.x before 0.2.5.11 does not properly handle pending-connection resolve states during periods of high DNS load, which allows remote attackers to cause a denial of service (assertion failure and daemon exit) via crafted packets.

Metrics

CVSS 3.1
7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability
2.19%

80.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
TorprojectTor< 0.2.4.26
TorprojectTor>= 0.2.5.1, < 0.2.5.11

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2015-2689?
Tor before 0.2.4.26 and 0.2.5.x before 0.2.5.11 does not properly handle pending-connection resolve states during periods of high DNS load, which allows remote attackers to cause a denial of service (assertion failure and daemon exit) via crafted packets.
How severe is CVE-2015-2689?
CVE-2015-2689 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 2.19% probability of exploitation in the next 30 days.
How do I fix CVE-2015-2689?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2015-2689?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST