CVE-2020-18442 [Low] | Denial of Service in Zziplib

CVE-2020-18442 is rated Exploit Available (50/100): CVSS Low severity, with low exploitation likelihood (EPSS 0.74%). 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 ↗

EDB-ID

Source

Kind

Published

Link

—

nvd_ref

exploit_tag

Exploit-DB ↗

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.06%	0.74%	+0.69%
2	2025-11-21	0.17%	0.06%	-0.11%
3	2025-11-18	—	0.17%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.06%

0.74%

+0.69%

2025-11-21

0.17%

0.06%

-0.11%

2025-11-18

—

0.17%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
3.3	3.1	LOW	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L` 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:L) A normal user session is enough; they don’t have to be admin. 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:L) Might cause slowdowns, glitches, or partial disruption—not a full brick.	1.8	1.4	[email protected]
2.1	2.0	LOW	`AV:L/AC:L/Au:N/C:N/I:N/A:P` Click to expand Access vector (AV:L) Requires local access to the target system. 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.	3.9	2.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

3.3

3.1

LOW

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L 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:L): A normal user session is enough; they don’t have to be admin.
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:L): Might cause slowdowns, glitches, or partial disruption—not a full brick.

1.8

1.4

[email protected]

2.1

2.0

LOW

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

Access vector (AV:L): Requires local access to the target system.
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.

3.9

2.9

[email protected]

OS Trackers for CVE-2020-18442

vendor	priority	summary	link
`alpine`	—	CVE-2020-18442: 1 source package rows (zziplib); 2 state rows across 2 repos (3.22-community, edge-community); fixed 0, open 2.	https://security.alpinelinux.org/vuln/CVE-2020-18442
`debian`	not yet assigned	CVE-2020-18442 not yet assigned priority: Debian including 1 source packages (zziplib), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5.	https://security-tracker.debian.org/tracker/CVE-2020-18442
`redhat`	low	—	https://access.redhat.com/security/cve/CVE-2020-18442
`suse`	medium	CVE-2020-18442 severity moderate: SUSE including 9 source package names (libzzip-0-13-0.13.67-10.33.1, libzzip-0-13-0.13.69-150000.3.17.1, …), 14 product×package rows across 6 product lines (SUSE Liberty Linux 8, SUSE Linux Enterprise Module for Basesystem 15 SP5, … (6 product lines)): Fixed 14.	https://www.suse.com/security/cve/CVE-2020-18442/
`ubuntu`	low	CVE-2020-18442 low priority: Ubuntu including 1 source packages (zziplib), 11 status rows across 11 suites (bionic, focal, groovy, hirsute, impish, jammy, kinetic, lunar, trusty, upstream, xenial): ignored 4, released 4, not-affected 2, DNE 1.	https://ubuntu.com/security/CVE-2020-18442

Affected software / configurations for CVE-2020-18442

Vendor	Product	Version	Raw CPE
gdraheim	zziplib	0.13.69	cpe:2.3:a:gdraheim:zziplib:0.13.69:::::::*
debian	debian_linux	9.0	cpe:2.3:o:debian:debian_linux:9.0:::::::*
fedoraproject	fedora	34	cpe:2.3:o:fedoraproject:fedora:34:::::::*
fedoraproject	fedora	35	cpe:2.3:o:fedoraproject:fedora:35:::::::*

References for CVE-2020-18442

URL	Tags
https://github.com/gdraheim/zziplib/issues/68	Exploit Issue Tracking Patch Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/12/msg00021.html	Mailing List Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TCFYD46OY4VAGJ4UX7IFOH5SHD4UW4ZA/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VVANTEBDQGOIPC5KCEVAGA5KT4KKTGWB/

URL

CVE-2020-18442

Public exploit references (Exploit-DB) for CVE-2020-18442

Exploit prediction scoring system (EPSS) score for CVE-2020-18442

Common vulnerability scoring system (CVSS) metrics for CVE-2020-18442

Weakness enumeration for CVE-2020-18442

OS Trackers for CVE-2020-18442

Affected software / configurations for CVE-2020-18442

References for CVE-2020-18442