CVE-2020-19131 [High] | Out-of-bounds Write in Libtiff

CVE-2020-19131 is rated High Exploit Risk (74.9/100): CVSS High severity, with medium exploitation likelihood (EPSS 2.26%). 2 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +1.71% over the last day, indicating growing attacker interest. Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

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#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.55%	2.26%	+1.71%
2	2026-04-06	0.80%	0.55%	-0.25%
3	2026-01-08	—	0.80%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.55%

2.26%

+1.71%

2026-04-06

0.80%

0.55%

-0.25%

2026-01-08

—

0.80%

—

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]
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

3.1

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]

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-2020-19131

vendor	priority	summary	link
`debian`	not yet assigned	CVE-2020-19131 not yet assigned priority: Debian including 1 source packages (tiff), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5.	https://security-tracker.debian.org/tracker/CVE-2020-19131
`redhat`	medium	—	https://access.redhat.com/security/cve/CVE-2020-19131
`suse`	medium	CVE-2020-19131 severity moderate: SUSE including 270 source package names (1.1.0-1.1:libtiff5-4.0.9-45.5.1, 1.19-3.1:libtiff5-4.0.9-45.5.1, …), 515 product×package rows across 178 product lines (Container private-registry/harbor-nginx, Container private-registry/harbor-portal, … (178 product lines)): Fixed 272, Known Affected 231, Known Not Affected 12.	https://www.suse.com/security/cve/CVE-2020-19131/
`ubuntu`	negligible	CVE-2020-19131 negligible priority: Ubuntu including 1 source packages (tiff), 8 status rows across 8 suites (bionic, focal, hirsute, impish, jammy, trusty, upstream, xenial): not-affected 4, released 4.	https://ubuntu.com/security/CVE-2020-19131

Affected software / configurations for CVE-2020-19131

Vendor	Product	Version	Raw CPE
simplesystems	libtiff	4.0.10	cpe:2.3:a:simplesystems:libtiff:4.0.10:::::::*
debian	debian_linux	9.0	cpe:2.3:o:debian:debian_linux:9.0:::::::*

References for CVE-2020-19131

URL	Tags
http://blog.topsec.com.cn/%E5%A4%A9%E8%9E%8D%E4%BF%A1%E5%85%B3%E4%BA%8Elibtiff%E4%B8%ADinvertimage%E5%87%BD%E6%95%B0%E5%A0%86%E6%BA%A2%E5%87%BA%E6%BC%8F%E6%B4%9E%E7%9A%84%E5%88%86%E6%9E%90/	Exploit Patch Third Party Advisory
http://bugzilla.maptools.org/show_bug.cgi?id=2831	Exploit Issue Tracking Patch
https://lists.debian.org/debian-lts-announce/2021/10/msg00004.html	Mailing List Third Party Advisory

URL

CVE-2020-19131

Public exploit references (Exploit-DB) for CVE-2020-19131

Exploit prediction scoring system (EPSS) score for CVE-2020-19131

Common vulnerability scoring system (CVSS) metrics for CVE-2020-19131

Weakness enumeration for CVE-2020-19131

OS Trackers for CVE-2020-19131

Affected software / configurations for CVE-2020-19131

References for CVE-2020-19131