Is CVE-2020-18770 in the CISA KEV catalog?

No. CVE-2020-18770 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-18770?

CVE-2020-18770 has a CVSS v3 base score of 5.5 (MEDIUM).

What is the EPSS score for CVE-2020-18770?

CVE-2020-18770 has an EPSS score of 0.32% (24th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-18770?

Upgrade zziplib on debian 13 to 0.13.78+dfsg.1-0.1 or later. Fixes are available for 13 affected products.

CVE & CISA-KEV Catalog

CVE-2020-18770

MEDIUM

5.5

CVSS v3

NVD

Description

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.

CWE-400Resource Exhaustion

How to fix

Remediation Available

zziplibDebian

Fixed in:0.13.78+dfsg.1-0.1CVE-2020-18770

zziplibRocky

Fixed in:0:0.13.68-13.el8_10RHSA-2024:3127

Fixed in:0:0.13.71-11.el9_4RHSA-2024:2377

zziplibRed Hat / RHEL

Fixed in:0:0.13.68-13.el8_10RHSA-2024:3127

Fixed in:0:0.13.71-11.el9_4RHSA-2024:2377

zziplib-debuginfoRed Hat / RHEL

Fixed in:0:0.13.68-13.el8_10RHSA-2024:3127

Fixed in:0:0.13.71-11.el9_4RHSA-2024:2377

zziplib-debuginfoRocky

Fixed in:0:0.13.68-13.el8_10RHSA-2024:3127

Fixed in:0:0.13.71-11.el9_4RHSA-2024:2377

zziplib-debugsourceRed Hat / RHEL

Fixed in:0:0.13.68-13.el8_10RHSA-2024:3127

Fixed in:0:0.13.71-11.el9_4RHSA-2024:2377

zziplib-debugsourceRocky

Fixed in:0:0.13.68-13.el8_10RHSA-2024:3127

Fixed in:0:0.13.71-11.el9_4RHSA-2024:2377

zziplib-develRed Hat / RHEL

Fixed in:0:0.13.68-13.el8_10RHSA-2024:3127

Fixed in:0:0.13.71-11.el9_4RHSA-2024:2377

zziplib-develRocky

Fixed in:0:0.13.68-13.el8_10RHSA-2024:3127

Fixed in:0:0.13.71-11.el9_4RHSA-2024:2377

zziplib-utilsRocky

Fixed in:0:0.13.68-13.el8_10RHSA-2024:3127

Fixed in:0:0.13.71-11.el9_4RHSA-2024:2377

zziplib-utilsRed Hat / RHEL

Fixed in:0:0.13.68-13.el8_10RHSA-2024:3127

Fixed in:0:0.13.71-11.el9_4RHSA-2024:2377

zziplib-utils-debuginfoRocky

Fixed in:0:0.13.68-13.el8_10RHSA-2024:3127

Fixed in:0:0.13.71-11.el9_4RHSA-2024:2377

zziplib-utils-debuginfoRed Hat / RHEL

Fixed in:0:0.13.68-13.el8_10RHSA-2024:3127

Fixed in:0:0.13.71-11.el9_4RHSA-2024:2377

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

0.32%probability of exploitation in 30 days

24thpercentile

Low risk: more likely to be exploited than 24% of all known CVEs.

References

Exploit1

github.com

Related Vulnerabilities

Other CWE-400 (Resource Exhaustion) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-44487	High	7.5	100%	KEV	Fix
CVE-2021-44228	Critical	10.0	100%	KEV + Ransom	Fix
CVE-2011-3192	High	7.8	99%	-	Fix
CVE-2019-11478	Medium	5.3	95%	-	Fix
CVE-2024-25617	Medium	5.3	89%	-	Fix
CVE-2018-1000115	High	7.5	89%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-07-10.