CVE-2016-1254 [High] | Memory Corruption in Tor

CVE-2016-1254 is rated Moderate Risk (58.8/100): CVSS High severity, with medium exploitation likelihood (EPSS 3.04%). Review affected assets and schedule remediation.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2025-03-30	4.17%	3.04%	-1.13%
2	2025-03-29	3.04%	4.17%	+1.13%
3	2025-03-17	—	3.04%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2025-03-30

4.17%

3.04%

-1.13%

2025-03-29

3.04%

4.17%

+1.13%

2025-03-17

—

3.04%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
7.5	3.0	HIGH	`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:N) No account or special rights needed—anonymous or random user is enough. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:N) Doesn’t really leak secrets in a meaningful way. Integrity (I:N) Data isn’t meaningfully altered or forged. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	3.9	3.6	[email protected]
5.0	2.0	MEDIUM	`AV:N/AC:L/Au:N/C:N/I:N/A:P` Click to expand Access vector (AV:N) Can be exploited remotely over network reachability. Access complexity (AC:L) Exploitation conditions are straightforward and predictable. Authentication (AU:N) No authentication is required. Confidentiality impact (C:N) No confidentiality impact. Integrity impact (I:N) No integrity impact. Availability impact (A:P) Partial availability impact.	10.0	2.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

7.5

3.0

HIGH

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

Attack vector (AV:N): Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N): No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N): Doesn’t really leak secrets in a meaningful way.
Integrity (I:N): Data isn’t meaningfully altered or forged.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

3.9

3.6

[email protected]

5.0

2.0

MEDIUM

AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand

Access vector (AV:N): Can be exploited remotely over network reachability.
Access complexity (AC:L): Exploitation conditions are straightforward and predictable.
Authentication (AU:N): No authentication is required.
Confidentiality impact (C:N): No confidentiality impact.
Integrity impact (I:N): No integrity impact.
Availability impact (A:P): Partial availability impact.

10.0

2.9

[email protected]

OS Trackers for CVE-2016-1254

vendor	priority	summary	link
`debian`	not yet assigned	CVE-2016-1254 not yet assigned priority: Debian including 1 source packages (tor), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5.	https://security-tracker.debian.org/tracker/CVE-2016-1254
`suse`	medium	CVE-2016-1254 severity moderate: SUSE including 1 source package names (tor-0.4.6.7-2.2), 1 product×package rows across 1 product lines (openSUSE Tumbleweed): Fixed 1.	https://www.suse.com/security/cve/CVE-2016-1254/
`ubuntu`	medium	CVE-2016-1254 medium priority: Ubuntu including 1 source packages (tor), 9 status rows across 9 suites (artful, bionic, cosmic, precise, trusty, upstream, xenial, yakkety, zesty): ignored 4, not-affected 3, released 2.	https://ubuntu.com/security/CVE-2016-1254

Affected software / configurations for CVE-2016-1254

Vendor	Product	Version	Raw CPE
torproject	tor	< 0.2.8.12	cpe:2.3:a:torproject:tor::::::::
debian	debian_linux	8.0	cpe:2.3:o:debian:debian_linux:8.0:::::::*
debian	debian_linux	9.0	cpe:2.3:o:debian:debian_linux:9.0:::::::*
fedoraproject	fedora	24	cpe:2.3:o:fedoraproject:fedora:24:::::::*
fedoraproject	fedora	25	cpe:2.3:o:fedoraproject:fedora:25:::::::*
opensuse	leap	42.2	cpe:2.3:o:opensuse:leap:42.2:::::::*
opensuse	opensuse	13.2	cpe:2.3:o:opensuse:opensuse:13.2:::::::*
opensuse_project	leap	42.1	cpe:2.3:o:opensuse_project:leap:42.1:::::::*

References for CVE-2016-1254

URL	Tags
http://lists.opensuse.org/opensuse-updates/2016-12/msg00154.html	Third Party Advisory
http://lists.opensuse.org/opensuse-updates/2016-12/msg00155.html	Third Party Advisory
https://blog.torproject.org/blog/tor-02812-released	Vendor Advisory
https://gitweb.torproject.org/tor.git/commit/?id=d978216dea6b21ac38230a59d172139185a68dbd	Patch Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FXOJSMCTIOHLBRYFBVEL3CDLGPZXX6WE/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GTU2R253477RZLYAJAR5DAXAON7KIVLA/
https://trac.torproject.org/projects/tor/ticket/21018	Issue Tracking Vendor Advisory
https://www.debian.org/security/2016/dsa-3741	Third Party Advisory

URL

CVE-2016-1254

Exploit prediction scoring system (EPSS) score for CVE-2016-1254

Common vulnerability scoring system (CVSS) metrics for CVE-2016-1254

Weakness enumeration for CVE-2016-1254

OS Trackers for CVE-2016-1254

Affected software / configurations for CVE-2016-1254

References for CVE-2016-1254