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CVE-2016-8860

20
FAUCET Score

CVE-2016-8860 describes a denial-of-service vulnerability in Tor versions prior to 0.2.8.9 and 0.2.9.4-alpha, affecting clients, hidden services, relays, and authorities. The flaw stems from a lack of NUL termination in buf_t data within or/buffers.c, allowing remote attackers to crash systems with crafted data. Rated 7.5 HIGH on CVSS, this vulnerability is easily exploitable over the network with low attack complexity and no user interaction required, leading to high availability impact. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
<= 0.2.8.8CPE matchmatch criteria
cpe:2.3:a:torproject:tor:*:*:*:*:*:*:*:*
0.2.9.0CPE matchmatch criteria
cpe:2.3:a:torproject:tor:0.2.9.0:alpha:*:*:*:*:*:*
0.2.9.1CPE matchmatch criteria
cpe:2.3:a:torproject:tor:0.2.9.1:alpha:*:*:*:*:*:*
0.2.9.2CPE matchmatch criteria
cpe:2.3:a:torproject:tor:0.2.9.2:alpha:*:*:*:*:*:*
0.2.9.3CPE matchmatch criteria
cpe:2.3:a:torproject:tor:0.2.9.3:alpha:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.95%
Probability of exploitation in next 30 days
EPSS Percentile
78.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0195 is in the 62nd percentile among its peer group of 51,506 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference
View patch

References

openwall.com / lists/oss-security/2016/10/19/11
Third Party Advisory
blog.torproject.org / blog/tor-0289-released-important-fixes
Release NotesVendor Advisory
github.com / torproject/tor/commit/3cea86eb2fbb65949673eb4ba8ebb695c87a57ce
PatchVendor Advisory
security.gentoo.org / glsa/201612-45
trac.torproject.org / projects/tor/ticket/20384
Vendor Advisory
debian.org / security/2016/dsa-3694
securityfocus.com / bid/95116