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CVE-2020-18770

An issue was discovered in function zzip_disk_entry_to_file_header in mmapped.c in zziplib 0.13...

5.5 MediumFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Local
Complexity
Low
Privileges needed
None
User interaction
Required

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

0.34%Up 0.3 points since Aug 23, 2023
90%50%10%1%

What each source reports

NVD Score used 5.5

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.

Record
CVE-2020-18770
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness
CWE-400
Updated
2026-11-02
CVE List No score

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.

Record
CVE-2020-18770
Weakness
CWE-400
Updated
2026-11-02
EUVDEUVD-2020-10687 No score

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.

Record
EUVD-2020-10687
Updated
2026-11-03
GitHub AdvisoriesGHSA-mjgv-6qmw-8jwc 5.5

An issue was discovered in function zzip_disk_entry_to_file_header in mmapped.c in zziplib 0.13...

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.

Record
GHSA-mjgv-6qmw-8jwc
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness
CWE-400
Updated
2026-11-02
OSVAZL-43720 5.5

CVE-2020-18770 affecting package zziplib 0.13.72-3

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.

Record
AZL-43720
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVAZL-44868 5.5

CVE-2020-18770 affecting package zziplib for versions less than 0.13.74-1

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.

Record
AZL-44868
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-02
Show 15 moreShow less
OSV 5.5

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.

Record
CVE-2020-18770
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVDEBIAN-CVE-2020-18770 5.5

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.

Record
DEBIAN-CVE-2020-18770
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVOESA-2023-1816 5.5

zziplib security update

The zziplib is a lightweight library to easily extract data from zip files. Applications can bundle files into a single zip archive and access them. The implementation is based only on the (free) subset of compression with the zlib algorithm which is actually used by the zip/unzip tools.

Security Fix(es):

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.(CVE-2020-18770)

Record
OESA-2023-1816
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVRHSA-2024:2377 5.5

Red Hat Security Advisory: zziplib security update

Record
RHSA-2024:2377
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVRHSA-2024:3127 5.5

Red Hat Security Advisory: zziplib security update

Record
RHSA-2024:3127
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVRLSA-2024:2377 5.5

Moderate: zziplib security update

The zziplib is a lightweight library to easily extract data from zip files.

Security Fix(es):

  • zziplib: invalid memory access at zzip_disk_entry_to_file_header in mmapped.c (CVE-2020-18770)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Additional Changes:

For detailed information on changes in this release, see the Rocky Linux 9.4 Release Notes linked from the References section.

Record
RLSA-2024:2377
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVRLSA-2024:3127 5.5

Moderate: zziplib security update

The zziplib is a lightweight library to easily extract data from zip files.

Security Fix(es):

  • zziplib: invalid memory access at zzip_disk_entry_to_file_header in mmapped.c (CVE-2020-18770)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Additional Changes:

For detailed information on changes in this release, see the Rocky Linux 8.10 Release Notes linked from the References section.

Record
RLSA-2024:3127
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2020-18770 5.5

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.

Record
UBUNTU-CVE-2020-18770
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVALSA-2024:2377 No score

Moderate: zziplib security update

The zziplib is a lightweight library to easily extract data from zip files.

Security Fix(es):

  • zziplib: invalid memory access at zzip_disk_entry_to_file_header in mmapped.c (CVE-2020-18770)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Additional Changes:

For detailed information on changes in this release, see the AlmaLinux Release Notes linked from the References section.

Record
ALSA-2024:2377
Updated
2026-11-02
OSVALSA-2024:3127 No score

Moderate: zziplib security update

The zziplib is a lightweight library to easily extract data from zip files.

Security Fix(es):

  • zziplib: invalid memory access at zzip_disk_entry_to_file_header in mmapped.c (CVE-2020-18770)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Additional Changes:

For detailed information on changes in this release, see the AlmaLinux Release Notes linked from the References section.

Record
ALSA-2024:3127
Updated
2026-11-02
OSVCLSA-2025-1755885569 No score

zziplib: Fix of CVE-2020-18770

  • CVE-2020-18770: fix denial-of-service issue in zzip_disk_entry_to_file_header function in mmapped.c
Record
CLSA-2025-1755885569
Updated
2026-11-02
OSVMGASA-2024-0167 No score

Updated zziplib packages fix security vulnerability

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. (CVE-2020-18770)

Record
MGASA-2024-0167
Updated
2026-11-02
OSVopenSUSE-SU-2024:13746-1 No score

libzzip-0-13-0.13.72-3.1 on GA media

These are all security issues fixed in the libzzip-0-13-0.13.72-3.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:13746-1
Updated
2026-11-02
OSVSUSE-SU-2024:0961-1 No score

Security update for zziplib

This update for zziplib fixes the following issues:

  • CVE-2020-18770: Fixed denial-of-service in function zzip_disk_entry_to_file_header in mmapped.c (bsc#1214577).
Record
SUSE-SU-2024:0961-1
Updated
2026-11-02
OSVSUSE-SU-2024:0970-1 No score

Security update for zziplib

This update for zziplib fixes the following issues:

Security issue fixed:

  • CVE-2020-18442: Fixed infinite loop in zzip_file_read() as used in unzzip_cat_file() (bsc#1187526).
  • CVE-2020-18770: Fixed denial-of-service in function zzip_disk_entry_to_file_header in mmapped.c (bsc#1214577).

Non-security issue fixed:

  • Implement an error message with a condition by checking the return value of a function call. (bsc#1154002)
Record
SUSE-SU-2024:0970-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
zziplib
AlmaLinux:9
before 0.13.71-11.el9_4
0.13.71-11.el9_4
zziplib-devel
AlmaLinux:9
before 0.13.71-11.el9_4
0.13.71-11.el9_4
zziplib-utils
AlmaLinux:9
before 0.13.71-11.el9_4
0.13.71-11.el9_4
zziplib
AlmaLinux:8
before 0.13.68-13.el8_10
0.13.68-13.el8_10
zziplib-devel
AlmaLinux:8
before 0.13.68-13.el8_10
0.13.68-13.el8_10
zziplib-utils
AlmaLinux:8
before 0.13.68-13.el8_10
0.13.68-13.el8_10
zziplib
Azure Linux:2
through 0.13.72-3 None known
zziplib
Azure Linux:3
before 0.13.74-1
0.13.74-1
zziplib
TuxCare:AlmaLinux:9.2
before 0.13.71-9.el9.tuxcare.els1
0.13.71-9.el9.tuxcare.els1
zziplib-devel
TuxCare:AlmaLinux:9.2
before 0.13.71-9.el9.tuxcare.els1
0.13.71-9.el9.tuxcare.els1
Show 44 moreShow less
Affected packages
PackageAffectedFixed
zziplib-utils
TuxCare:AlmaLinux:9.2
before 0.13.71-9.el9.tuxcare.els1
0.13.71-9.el9.tuxcare.els1
zziplib
Debian:12
All versions, plus listed versions
0.13.72+dfsg.1-1.10.13.72+dfsg.1-1.20.13.72+dfsg.1-1.2~exp10.13.72+dfsg.1-1.30.13.78+dfsg.1-0.10.13.78+dfsg.1-0.2
None known
zziplib
Debian:13
before 0.13.78+dfsg.1-0.1
0.13.78+dfsg.1-0.1
zziplib
Debian:14
before 0.13.78+dfsg.1-0.1
0.13.78+dfsg.1-0.1
zziplib
Mageia:9
before 0.13.72-2.1.mga9
0.13.72-2.1.mga9
zziplib
openEuler:20.03-LTS-SP1
before 0.13.69-9.oe1
0.13.69-9.oe1
zziplib
openEuler:20.03-LTS-SP3
before 0.13.69-9.oe1
0.13.69-9.oe1
zziplib
openEuler:22.03-LTS
before 0.13.71-5.oe2203sp2
0.13.71-5.oe2203sp2
zziplib
openEuler:22.03-LTS-SP1
before 0.13.71-5.oe2203sp1
0.13.71-5.oe2203sp1
zziplib
openEuler:22.03-LTS-SP2
before 0.13.71-5.oe2203sp2
0.13.71-5.oe2203sp2
zziplib
Red Hat:enterprise_linux:9::appstream
before 0:0.13.71-11.el9_4
0:0.13.71-11.el9_4
zziplib-debuginfo
Red Hat:enterprise_linux:9::appstream
before 0:0.13.71-11.el9_4
0:0.13.71-11.el9_4
zziplib-debugsource
Red Hat:enterprise_linux:9::appstream
before 0:0.13.71-11.el9_4
0:0.13.71-11.el9_4
zziplib-utils
Red Hat:enterprise_linux:9::appstream
before 0:0.13.71-11.el9_4
0:0.13.71-11.el9_4
zziplib-utils-debuginfo
Red Hat:enterprise_linux:9::appstream
before 0:0.13.71-11.el9_4
0:0.13.71-11.el9_4
zziplib-debuginfo
Red Hat:enterprise_linux:9::crb
before 0:0.13.71-11.el9_4
0:0.13.71-11.el9_4
zziplib-debugsource
Red Hat:enterprise_linux:9::crb
before 0:0.13.71-11.el9_4
0:0.13.71-11.el9_4
zziplib-devel
Red Hat:enterprise_linux:9::crb
before 0:0.13.71-11.el9_4
0:0.13.71-11.el9_4
zziplib-utils-debuginfo
Red Hat:enterprise_linux:9::crb
before 0:0.13.71-11.el9_4
0:0.13.71-11.el9_4
zziplib
Red Hat:enterprise_linux:8::appstream
before 0:0.13.68-13.el8_10
0:0.13.68-13.el8_10
zziplib-debuginfo
Red Hat:enterprise_linux:8::appstream
before 0:0.13.68-13.el8_10
0:0.13.68-13.el8_10
zziplib-debugsource
Red Hat:enterprise_linux:8::appstream
before 0:0.13.68-13.el8_10
0:0.13.68-13.el8_10
zziplib-utils
Red Hat:enterprise_linux:8::appstream
before 0:0.13.68-13.el8_10
0:0.13.68-13.el8_10
zziplib-utils-debuginfo
Red Hat:enterprise_linux:8::appstream
before 0:0.13.68-13.el8_10
0:0.13.68-13.el8_10
zziplib-debuginfo
Red Hat:enterprise_linux:8::crb
before 0:0.13.68-13.el8_10
0:0.13.68-13.el8_10
zziplib-debugsource
Red Hat:enterprise_linux:8::crb
before 0:0.13.68-13.el8_10
0:0.13.68-13.el8_10
zziplib-devel
Red Hat:enterprise_linux:8::crb
before 0:0.13.68-13.el8_10
0:0.13.68-13.el8_10
zziplib-utils-debuginfo
Red Hat:enterprise_linux:8::crb
before 0:0.13.68-13.el8_10
0:0.13.68-13.el8_10
zziplib
Rocky Linux:9
before 0:0.13.71-11.el9_4
0:0.13.71-11.el9_4
zziplib
Rocky Linux:8
before 0:0.13.68-13.el8_10
0:0.13.68-13.el8_10
zziplib
SUSE:Linux Enterprise Software Development Kit 12 SP5
before 0.13.67-10.36.1
0.13.67-10.36.1
zziplib
SUSE:Linux Enterprise Workstation Extension 12 SP5
before 0.13.67-10.36.1
0.13.67-10.36.1
zziplib
SUSE:Linux Enterprise Module for Basesystem 15 SP5
From an advisory covering 2 CVEs
before 0.13.69-150000.3.17.1
0.13.69-150000.3.17.1
zziplib
SUSE:Linux Enterprise Server 15 SP4-TERADATA
From an advisory covering 2 CVEs
before 0.13.69-150000.3.17.1
0.13.69-150000.3.17.1
zziplib
openSUSE:Leap 15.5
From an advisory covering 2 CVEs
before 0.13.69-150000.3.17.1
0.13.69-150000.3.17.1
zziplib
Ubuntu:Pro:16.04:LTS
All versions, plus listed versions
0.13.62-30.13.62-3ubuntu0.16.04.10.13.62-3ubuntu0.16.04.20.13.62-3ubuntu0.16.04.2+esm1
None known
zziplib
Ubuntu:Pro:18.04:LTS
All versions, plus listed versions
0.13.62-3.10.13.62-3.1ubuntu0.18.04.10.13.62-3.1ubuntu0.18.04.1+esm1
None known
zziplib
Ubuntu:20.04:LTS
All versions, plus listed versions
0.13.62-3.20.13.62-3.2ubuntu10.13.62-3.2ubuntu1.1
None known
zziplib
Ubuntu:22.04:LTS
All versions, plus listed versions
0.13.72+dfsg.1-1.1
None known
zziplib
Ubuntu:24.04:LTS
All versions, plus listed versions
0.13.72+dfsg.1-1.10.13.72+dfsg.1-1.20.13.72+dfsg.1-1.2build1
None known
zziplib
Ubuntu:25.10
All versions, plus listed versions
0.13.78+dfsg.1-0.1
None known
zziplib
Ubuntu:26.10
All versions, plus listed versions
0.13.78+dfsg.1-0.2
None known
zziplib
Ubuntu:26.04:LTS
All versions, plus listed versions
0.13.78+dfsg.1-0.10.13.78+dfsg.1-0.2
None known
zziplib
openSUSE:Tumbleweed
before 0.13.72-3.1
0.13.72-3.1

History

History
RecordedChangedSources
affected, facts
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2020-18770 is a medium vulnerability (CVSS 5.5) in Gdraheim Zziplib, published August 22, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.34%, the 28th percentile. Fixed in zziplib 0.13.71-11.el9_4.

References

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