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CVE-2017-17969· NVD / CVE Program· CNA mitre

Heap-based buffer overflow in the NCompress::NShrink::CDecoder::CodeReal method in 7-Zip before 18.00 and p7zip allows remote attackers to c

Heap-based buffer overflow in the NCompress::NShrink::CDecoder::CodeReal method in 7-Zip before 18.00 and p7zip allows remote attackers to cause a denial of service (out-of-bounds write) or potentially execute arbitrary code via a crafted ZIP archive.

HighCVSS 7.8 · v3.0—No exploit Fix available
Published
Jan 30, 2018
Updated
Jun 16, 2026
EPSS
4.9% · 92th percentile
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Report tools

JSON

Action score

32

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 4.9%

Affected systems

VendorProduct
7-zip7-zip
7-zipp7zip
debiandebian linux

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • 7-zip 7-zipbefore 18.00
  • 7-zip p7zipbefore 18.0
  • debian debian linux7.0
  • debian debian linux8.0
  • debian debian linux9.0

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Alpine:v3.10p7zipbefore 16.02-r216.02-r2
Debian:12p7zipbefore 16.02+dfsg-516.02+dfsg-5
Debian:7p7zipbefore 9.20.1~dfsg.1-4+deb7u39.20.1~dfsg.1-4+deb7u3
Debian:8p7zipbefore 9.20.1~dfsg.1-4.1+deb8u39.20.1~dfsg.1-4.1+deb8u3
Debian:9p7zipbefore 16.02+dfsg-3+deb9u116.02+dfsg-3+deb9u1
openSUSE:Tumbleweedp7zipbefore 16.02-11.316.02-11.3
SUSE:Linux Enterprise Desktop 12 SP2p7zipbefore 9.20.1-7.3.19.20.1-7.3.1

Same product

7-zip: all records

Other highest-scoring records for the same primary product.

  • CVE-2025-04117-Zip Mark-of-the-Web Bypass VulnerabilityKEV
    78This week
  • CVE-2023-31102Ppmd7.c in 7-Zip before 23.00 allows an integer underflow and invalid read operation via a crafted 7Z archive.
    48Plan
  • CVE-2008-6536Unspecified vulnerability in 7-zip before 4.5.7 has unknown impact and remote attack vectors, as demonstrated by the PROTOS GENOME test suit
    41Plan
  • CVE-2025-110017-Zip ZIP File Parsing Directory Traversal Remote Code Execution Vulnerability
    39Monitor
  • CVE-2024-114777-Zip Zstandard Decompression Integer Underflow Remote Code Execution Vulnerability
    38Monitor
  • CVE-2026-48095GHSL-2026-140_7-Zip: 7-Zip has a heap buffer overflow via NTFS compressed stream buffer under-allocation
    35Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
alpine:p7zip16.02-r2 · Alpine:v3.10Package registry (OSV)
debian:p7zip16.02+dfsg-5 · Debian:12Package registry (OSV)
opensuse:p7zip16.02-11.3 · openSUSE:TumbleweedPackage registry (OSV)
suse:p7zip9.20.1-7.3.1 · SUSE:Linux Enterprise Desktop 12 SP2Package 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.

EPSS, last 120 days

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 researchers

Finders, 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 Write

CVSS vector

CVSS:3.0/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 help

Change log

  1. Fix✗ → ✓

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References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records