An issue was discovered in function zzip_disk_entry_to_file_header in mmapped.c in…
Priority MEDIUM 58CWE-400Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Partial Red Hat: 4 fixed, 1 without a fix
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-400.
Summary
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.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00344 28th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial Red Hat: 2 advisoriesRed Hat: 4 fixed, 1 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
Remediation
Red Hat 2 advisories
- RHSA-2024:3127 Released 2024-05-22 · Red Hat rating Moderatezziplib security update
- Red Hat Enterprise Linux AppStream (v. 8) zziplib-0.13.68-13.el8_10, zziplib-utils-0.13.68-13.el8_10
- Red Hat Enterprise Linux CRB (v. 8) zziplib-devel-0.13.68-13.el8_10
- RHSA-2024:2377 Released 2024-04-30 · Red Hat rating Moderatezziplib security update
- Red Hat Enterprise Linux AppStream (v. 9) zziplib-0.13.71-11.el9_4, zziplib-utils-0.13.71-11.el9_4
- Red Hat Enterprise Linux CRB (v. 9) zziplib-devel-0.13.71-11.el9_4
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 7 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux AppStream (v. 8) | Fixed | RHSA-2024:3127 |
| Red Hat Enterprise Linux AppStream (v. 9) | Fixed | RHSA-2024:2377 |
| Red Hat Enterprise Linux CRB (v. 8) | Fixed | RHSA-2024:3127 |
| Red Hat Enterprise Linux CRB (v. 9) | Fixed | RHSA-2024:2377 |
Timeline
- 2026-10-02 Threatist record created from CVE-2020-18770
- 2026-10-03 Alias added: GHSA-mjgv-6qmw-8jwc
References
More gdraheim Zziplib vulnerabilities
- TI-2024-26186 A Stack Buffer Overflow vulnerability in zziplibv 0.13.77 allows attackers to cause a… CVSS 3.1HIGH 7.5
- TI-2018-05016 In ZZIPlib 0.13.68, there is an uncontrolled memory allocation and a crash in the… CVSS 3.0MEDIUM 6.5
- TI-2018-11868 An issue was discovered in ZZIPlib through 0.13.69. CVSS 3.0MEDIUM 6.5
- TI-2018-04818 In ZZIPlib 0.13.67, there is a bus error caused by loading of a misaligned address (when… CVSS 3.0MEDIUM 6.5
- TI-2018-04817 In ZZIPlib 0.13.67, there is a bus error caused by loading of a misaligned address in the… CVSS 3.0MEDIUM 6.5
- TI-2018-04766 In ZZIPlib 0.13.67, there is a memory alignment error and bus error in the… CVSS 3.0MEDIUM 6.5
Sources
- CVE-2020-18770 · CVE Program
- CVE-2020-18770 · NVD
- FIRST EPSS
- GHSA-mjgv-6qmw-8jwc · GitHub Advisory Database · CC BY 4.0
- CVE-2020-18770 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences