CVE-2020-18770

Exp

An issue was discovered in function zzip_disk_entry_to_file_header in mmapped.c in zziplib 0.13.69, which will lead to a denial-of-service.

Published: 2023-08-22 Last update: 2025-07-10 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-18770 is rated Exploit Available (50/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.32%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2020-18770

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

Exploit prediction scoring system (EPSS) score for CVE-2020-18770

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.02% 0.32% +0.30%
2 2025-03-17 0.05% 0.02% -0.03%
3 2025-03-14 — 0.05% —

Full EPSS history (4 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-18770

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.5 3.1 MEDIUM
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/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: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.
 1.8 3.6 [email protected]

Weakness enumeration for CVE-2020-18770

OS Trackers for CVE-2020-18770

vendor priority summary link
alpine — CVE-2020-18770: 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-2020-18770
debian not yet assigned CVE-2020-18770 not yet assigned priority: Debian including 1 source packages (zziplib), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 3, open 2. https://security-tracker.debian.org/tracker/CVE-2020-18770
redhat medium — https://access.redhat.com/security/cve/CVE-2020-18770
suse low CVE-2020-18770 severity low: SUSE including 20 source package names (libzzip-0-13-0.13.67-10.36.1, libzzip-0-13-0.13.69-150000.3.17.1, …), 25 product×package rows across 10 product lines (SUSE Liberty Linux 8, SUSE Liberty Linux 9, … (10 product lines)): Fixed 25. https://www.suse.com/security/cve/CVE-2020-18770/
ubuntu medium CVE-2020-18770 medium priority: Ubuntu including 1 source packages (zziplib), 12 status rows across 12 suites (bionic, focal, jammy, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): needs-triage 7, ignored 5. https://ubuntu.com/security/CVE-2020-18770

Affected software / configurations for CVE-2020-18770

Vendor Product Version Raw CPE
gdraheim zziplib 0.13.69 cpe:2.3:a:gdraheim:zziplib:0.13.69:*:*:*:*:*:*:*

References for CVE-2020-18770

URL Tags
https://github.com/gdraheim/zziplib/issues/69 Exploit Issue Tracking Third Party Advisory
cvelogic Threat Intelligence