CVE-2020-10592 [High] | Denial of Service in Tor

CVE-2020-10592 is rated Moderate Risk (58.7/100): CVSS High severity, with medium exploitation likelihood (EPSS 2.00%). Review affected assets and schedule remediation.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2025-11-21	2.34%	2.00%	-0.34%
2	2025-11-18	1.99%	2.34%	+0.36%
3	2025-03-30	—	1.99%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2025-11-21

2.34%

2.00%

-0.34%

2025-11-18

1.99%

2.34%

+0.36%

2025-03-30

—

1.99%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
7.5	3.1	HIGH	`CVSS:3.1/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]
7.8	2.0	HIGH	`AV:N/AC:L/Au:N/C:N/I:N/A:C` 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:C) Complete availability impact.	10.0	6.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

7.5

3.1

HIGH

CVSS:3.1/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]

7.8

2.0

HIGH

AV:N/AC:L/Au:N/C:N/I:N/A:C 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:C): Complete availability impact.

10.0

6.9

[email protected]

OS Trackers for CVE-2020-10592

vendor	priority	summary	link
`alpine`	high	CVE-2020-10592: 1 source package rows (tor); 9 state rows across 7 repos (3.17-community, 3.18-community, 3.19-community, 3.20-community, 3.21-community, 3.22-community, edge-community); fixed 7, open 2.	https://security.alpinelinux.org/vuln/CVE-2020-10592
`debian`	not yet assigned	CVE-2020-10592 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-2020-10592
`gentoo`	low	CVE-2020-10592: 1 GLSA(s) (202003-50), 1 atom(s) (net-vpn/tor); latest impact low.	https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2020-10592
`ubuntu`	low	CVE-2020-10592 low priority: Ubuntu including 1 source packages (tor), 10 status rows across 10 suites (bionic, eoan, focal, groovy, hirsute, impish, jammy, trusty, upstream, xenial): not-affected 8, ignored 1, released 1.	https://ubuntu.com/security/CVE-2020-10592

Affected software / configurations for CVE-2020-10592

Vendor	Product	Version	Raw CPE
torproject	tor	>= 0.3.5, < 0.3.5.10	cpe:2.3:a:torproject:tor::::::::
torproject	tor	> 0.4.1.0, < 0.4.1.9	cpe:2.3:a:torproject:tor::::::::
torproject	tor	> 0.4.2.0, <= 0.4.2.7	cpe:2.3:a:torproject:tor::::::::
opensuse	backports	sle-15	cpe:2.3:o:opensuse:backports:sle-15:sp1::::::
opensuse	leap	15.1	cpe:2.3:o:opensuse:leap:15.1:::::::*

References for CVE-2020-10592

URL	Tags
http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00045.html	Mailing List Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00052.html	Mailing List Third Party Advisory
https://security.gentoo.org/glsa/202003-50	Third Party Advisory
https://trac.torproject.org/projects/tor/ticket/33120	Vendor Advisory

URL

CVE-2020-10592

Exploit prediction scoring system (EPSS) score for CVE-2020-10592

Common vulnerability scoring system (CVSS) metrics for CVE-2020-10592

Weakness enumeration for CVE-2020-10592

OS Trackers for CVE-2020-10592

Affected software / configurations for CVE-2020-10592

References for CVE-2020-10592