Heap-based buffer overflow in the CRC32 verification in Info-ZIP UnZip 6.0 and earlier allows remote attackers to execute arbitrary code via
Heap-based buffer overflow in the CRC32 verification in Info-ZIP UnZip 6.0 and earlier allows remote attackers to execute arbitrary code via a crafted zip file in the -t command argument to the unzip command.
- Published
- Jan 31, 2020
- Updated
- Jun 16, 2026
- EPSS
- 7.4% · 94th percentile
- CWE
- CWE-787
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Report tools
Action score
33
Monitor
Low priority for now.
- CVSS
- 31 / 40 · 7.8 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 2 / 30 · 7.4%
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| unzip project | unzip | cpe:2.3:a:unzip_project:unzip |
| redhat | enterprise linux desktop | cpe:2.3:o:redhat:enterprise_linux_desktop |
| redhat | enterprise linux server | cpe:2.3:o:redhat:enterprise_linux_server |
| redhat | enterprise linux server aus | cpe:2.3:o:redhat:enterprise_linux_server_aus |
| redhat | enterprise linux server eus | cpe:2.3:o:redhat:enterprise_linux_server_eus |
| redhat | enterprise linux server tus | cpe:2.3:o:redhat:enterprise_linux_server_tus |
| redhat | enterprise linux workstation | cpe:2.3:o:redhat:enterprise_linux_workstation |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- redhat enterprise linux desktop6.0
- redhat enterprise linux desktop7.0
- redhat enterprise linux server6.0
- redhat enterprise linux server7.0
- redhat enterprise linux server aus6.6
- redhat enterprise linux server aus7.3
- redhat enterprise linux server aus7.4
- redhat enterprise linux server aus7.6
- redhat enterprise linux server aus7.7
- redhat enterprise linux server eus6.6
- redhat enterprise linux server eus7.1
- redhat enterprise linux server eus7.2
- redhat enterprise linux server eus7.3
- redhat enterprise linux server eus7.4
- redhat enterprise linux server eus7.5
- redhat enterprise linux server eus7.6
- redhat enterprise linux server eus7.7
- redhat enterprise linux server tus6.6
- redhat enterprise linux server tus7.3
- redhat enterprise linux server tus7.6
Versions reported by the vendor
Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.
Info-ZIP UnZip
- 6.0 and earlieraffected
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Alpine:v3.10 | unzip | before 6.0-r3 | 6.0-r3 |
| Debian:12 | unzip | before 6.0-16 | 6.0-16 |
| Debian:6.0 | unzip | before 6.0-4+deb6u1 | 6.0-4+deb6u1 |
| Debian:6.0 | unzip | before 6.0-4+deb6u2 | 6.0-4+deb6u2 |
| Debian:7 | unzip | before 6.0-8+deb7u1 | 6.0-8+deb7u1 |
| openSUSE:Tumbleweed | unzip | before 6.00-31.1 | 6.00-31.1 |
| Red Hat:enterprise_linux:6::client | unzip | before 0:6.0-2.el6_6 | 0:6.0-2.el6_6 |
| Red Hat:enterprise_linux:6::client | unzip-debuginfo | before 0:6.0-2.el6_6 | 0:6.0-2.el6_6 |
| Red Hat:enterprise_linux:7::client | unzip | before 0:6.0-15.el7 | 0:6.0-15.el7 |
| Red Hat:enterprise_linux:7::client | unzip-debuginfo | before 0:6.0-15.el7 | 0:6.0-15.el7 |
| Red Hat:enterprise_linux:7::server | unzip | before 0:6.0-15.ael7b | 0:6.0-15.ael7b |
| Red Hat:enterprise_linux:7::server | unzip-debuginfo | before 0:6.0-15.ael7b | 0:6.0-15.ael7b |
Same product
unzip project: all recordsOther highest-scoring records for the same primary product.
- CVE-2018-1000035A heap-based buffer overflow exists in Info-Zip UnZip version <= 6.00 in the processing of password-protected archives that allows an attack40Plan
- CVE-2020-36561Path traversal in github.com/yi-ge/unzip36Monitor
- CVE-2014-8141Heap-based buffer overflow in the getZip64Data function in Info-ZIP UnZip 6.0 and earlier allows remote attackers to execute arbitrary code 33Monitor
- CVE-2014-8140Heap-based buffer overflow in the test_compr_eb function in Info-ZIP UnZip 6.0 and earlier allows remote attackers to execute arbitrary code33Monitor
- CVE-2014-9636unzip 6.0 allows remote attackers to cause a denial of service (out-of-bounds read or write and crash) via an extra field with an uncompress24Monitor
- CVE-2022-0530A flaw was found in Unzip.23Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| alpine:unzip | 6.0-r3 · Alpine:v3.10 | Package registry (OSV) |
| debian:unzip | 6.0-16 · Debian:12 | Package registry (OSV) |
| opensuse:unzip | 6.00-31.1 · openSUSE:Tumbleweed | Package registry (OSV) |
| red hat:unzip | 0:6.0-2.el6_6 · Red Hat:enterprise_linux:6::client | Package registry (OSV) |
| red hat:unzip-debuginfo | 0:6.0-2.el6_6 · Red Hat:enterprise_linux:6::client | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Someone with local access to the system can trigger it.
- No account or password is required.
- A user must open a link or visit a page.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- high · data can be read
- Integrity
- high · data or configuration can be modified
- Availability
- high · the service can be disrupted
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
Weakness class (CWE)
CWE-787 · Out-of-bounds WriteCVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- www.ocert.org/advisories/ocert-2014-011.html
- www.securitytracker.com/id/1031433
- access.redhat.com/errata/RHSA-2015:0700
- bugzilla.redhat.com/show_bug.cgi?id=1174844
Vendor advisories and official records. Exploit/PoC links are deliberately left out.