CVE-2020-23922 [High] | Out-of-bounds Read in Giflib

CVE-2020-23922 is rated High Exploit Risk (71.6/100): CVSS High severity, with medium exploitation likelihood (EPSS 2.23%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

EDB-ID	Source	Kind	Published	Link
—	nvd_ref	exploit_tag		Exploit-DB ↗

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Kind

Published

Link

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Exploit-DB ↗

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	2.12%	2.23%	+0.11%
2	2026-05-09	1.62%	2.12%	+0.49%
3	2026-05-03	—	1.62%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

2.12%

2.23%

+0.11%

2026-05-09

1.62%

2.12%

+0.49%

2026-05-03

—

1.62%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
7.1	3.1	HIGH	`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H` Click to expand Attack vector (AV:L) They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by. 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: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:H) Serious risk that confidential data gets exposed in a big 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.	1.8	5.2	[email protected]
5.8	2.0	MEDIUM	`AV:N/AC:M/Au:N/C:P/I:N/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:N) No authentication is required. Confidentiality impact (C:P) Partial confidentiality impact. Integrity impact (I:N) No integrity impact. Availability impact (A:P) Partial availability impact.	8.6	4.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

7.1

3.1

HIGH

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H Click to expand

Attack vector (AV:L): They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
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: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:H): Serious risk that confidential data gets exposed in a big 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.

1.8

5.2

[email protected]

5.8

2.0

MEDIUM

AV:N/AC:M/Au:N/C:P/I:N/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:N): No authentication is required.
Confidentiality impact (C:P): Partial confidentiality impact.
Integrity impact (I:N): No integrity impact.
Availability impact (A:P): Partial availability impact.

8.6

4.9

[email protected]

OS Trackers for CVE-2020-23922

vendor	priority	summary	link
`debian`	unimportant	CVE-2020-23922 unimportant priority: Debian including 1 source packages (giflib), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 3, open 2.	https://security-tracker.debian.org/tracker/CVE-2020-23922
`redhat`	medium	—	https://access.redhat.com/security/cve/CVE-2020-23922
`suse`	low	CVE-2020-23922 severity low: SUSE including 6 source package names (giflib, giflib-devel, giflib-progs, libgif6, libgif6-32bit, libgif7), 122 product×package rows across 48 product lines (HPE Helion OpenStack 8, SUSE CaaS Platform 4.0, … (48 product lines)): Known Not Affected 122.	https://www.suse.com/security/cve/CVE-2020-23922/
`ubuntu`	low	CVE-2020-23922 low priority: Ubuntu including 1 source packages (giflib), 13 status rows across 13 suites (bionic, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, trusty, upstream, xenial): not-affected 6, ignored 5, DNE 1, needed 1.	https://ubuntu.com/security/CVE-2020-23922

Affected software / configurations for CVE-2020-23922

Vendor	Product	Version	Raw CPE
giflib_project	giflib	<= 5.1.4	cpe:2.3:a:giflib_project:giflib::::::::
apache	bookkeeper	4.12.1	cpe:2.3:a:apache:bookkeeper:4.12.1:::::::*

References for CVE-2020-23922

URL	Tags
https://cwe.mitre.org/data/definitions/126.html	Technical Description Third Party Advisory
https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E
https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E
https://sourceforge.net/p/giflib/bugs/151/	Exploit Third Party Advisory

URL

CVE-2020-23922

Public exploit references (Exploit-DB) for CVE-2020-23922

Exploit prediction scoring system (EPSS) score for CVE-2020-23922

Common vulnerability scoring system (CVSS) metrics for CVE-2020-23922

Weakness enumeration for CVE-2020-23922

OS Trackers for CVE-2020-23922

Affected software / configurations for CVE-2020-23922

References for CVE-2020-23922