CVE-2020-11039 [High] | Integer Overflow in Freerdp

CVE-2020-11039 is rated Moderate Risk (56.1/100): CVSS High severity, with medium exploitation likelihood (EPSS 1.27%). EPSS rose +1.10% over the last day, indicating growing attacker interest. Review affected assets and schedule remediation.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.17%	1.27%	+1.10%
2	2025-11-21	0.52%	0.17%	-0.35%
3	2025-11-18	—	0.52%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.17%

1.27%

+1.10%

2025-11-21

0.52%

0.17%

-0.35%

2025-11-18

—

0.52%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
8.0	3.1	HIGH	`CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N` 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:H) Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work. Privileges required (PR:N) No account or special rights needed—anonymous or random user is enough. User interaction (UI:R) A real person has to do something—click, install, enable—otherwise it doesn’t land. Scope (S:C) Breaking this can reach past the original component and bite other resources—bigger blast radius. Confidentiality (C:H) Serious risk that confidential data gets exposed in a big way. Integrity (I:H) They could widely tamper with or forge data—trust in the data is badly hurt. Availability (A:N) Service keeps running; no real outage angle.	1.6	5.8	[email protected]
6.8	3.1	MEDIUM	`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:L` 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:L) A normal user session is enough; they don’t have to be admin. User interaction (UI:R) A real person has to do something—click, install, enable—otherwise it doesn’t land. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:L) Some sensitive info could get out, but not a total data dump. Integrity (I:H) They could widely tamper with or forge data—trust in the data is badly hurt. Availability (A:L) Might cause slowdowns, glitches, or partial disruption—not a full brick.	2.1	4.7	[email protected]
6.0	2.0	MEDIUM	`AV:N/AC:M/Au:S/C:P/I:P/A:P` Click to expand Access vector (AV:N) Can be exploited remotely over network reachability. Access complexity (AC:M) Exploitation needs some favorable conditions, but not exceptional ones. Authentication (AU:S) A single authentication is required. Confidentiality impact (C:P) Partial confidentiality impact. Integrity impact (I:P) Partial integrity impact. Availability impact (A:P) Partial availability impact.	6.8	6.4	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

8.0

3.1

HIGH

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N 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:H): Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N): No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R): A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:C): Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:H): Serious risk that confidential data gets exposed in a big way.
Integrity (I:H): They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:N): Service keeps running; no real outage angle.

1.6

5.8

[email protected]

6.8

3.1

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:L 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:L): A normal user session is enough; they don’t have to be admin.
User interaction (UI:R): A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:L): Some sensitive info could get out, but not a total data dump.
Integrity (I:H): They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:L): Might cause slowdowns, glitches, or partial disruption—not a full brick.

2.1

4.7

[email protected]

6.0

2.0

MEDIUM

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

Access vector (AV:N): Can be exploited remotely over network reachability.
Access complexity (AC:M): Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:S): A single authentication is required.
Confidentiality impact (C:P): Partial confidentiality impact.
Integrity impact (I:P): Partial integrity impact.
Availability impact (A:P): Partial availability impact.

6.8

6.4

[email protected]

OS Trackers for CVE-2020-11039

vendor	priority	summary	link
`alpine`	medium	CVE-2020-11039: 1 source package rows (freerdp); 6 state rows across 2 repos (3.22-community, edge-community); fixed 0, open 6.	https://security.alpinelinux.org/vuln/CVE-2020-11039
`debian`	not yet assigned	CVE-2020-11039 not yet assigned priority: Debian including 1 source packages (freerdp2), 2 status rows across 2 suites (bookworm, bullseye): resolved 2.	https://security-tracker.debian.org/tracker/CVE-2020-11039
`redhat`	medium	—	https://access.redhat.com/security/cve/CVE-2020-11039
`ubuntu`	low	CVE-2020-11039 low priority: Ubuntu including 2 source packages (freerdp, freerdp2), 34 status rows across 17 suites (bionic, eoan, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): DNE 17, not-affected 10, released 4, needed 2, needs-triage 1.	https://ubuntu.com/security/CVE-2020-11039

Affected software / configurations for CVE-2020-11039

Vendor	Product	Version	Raw CPE
freerdp	freerdp	< 2.1.0	cpe:2.3:a:freerdp:freerdp::::::::
opensuse	leap	15.1	cpe:2.3:o:opensuse:leap:15.1:::::::*
debian	debian_linux	10.0	cpe:2.3:o:debian:debian_linux:10.0:::::::*

References for CVE-2020-11039

URL	Tags
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00080.html	Third Party Advisory
https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-mx9p-f6q8-mqwq	Third Party Advisory
https://lists.debian.org/debian-lts-announce/2023/10/msg00008.html	Mailing List Third Party Advisory

URL

CVE-2020-11039 | Integer Overflow in FreeRDP

Exploit prediction scoring system (EPSS) score for CVE-2020-11039

Common vulnerability scoring system (CVSS) metrics for CVE-2020-11039

Weakness enumeration for CVE-2020-11039

OS Trackers for CVE-2020-11039

Affected software / configurations for CVE-2020-11039

References for CVE-2020-11039