CVE-2016-9844

Buffer overflow in the zi_short function in zipinfo.c in Info-Zip UnZip 6.0 allows remote attackers to cause a denial of service (crash) via a large compression method value in the central directory file header.

Published: 2017-01-18 Last update: 2026-05-13 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2016-9844 is rated Low Risk (37.6/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.84%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2016-9844

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 9.79% 1.84% -7.95%
2 2026-03-05 8.55% 9.79% +1.24%
3 2025-09-08 — 8.55% —

Full EPSS history (18 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2016-9844

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
4.0 3.0 MEDIUM
CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:L)
Might cause slowdowns, glitches, or partial disruption—not a full brick.
 2.5 1.4 [email protected]
2.1 2.0 LOW
AV:L/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:L)
Requires local access to the target system.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 3.9 2.9 [email protected]

Weakness enumeration for CVE-2016-9844

OS Trackers for CVE-2016-9844

vendor priority summary link
alpine — CVE-2016-9844: 1 source package rows (unzip); 41 state rows across 11 repos (3.10-main, 3.11-main, 3.12-main, 3.17-main, 3.18-main, 3.19-main, 3.20-main, 3.21-main, 3.22-main, 3.23-main, edge-main); fixed 36, open 5. https://security.alpinelinux.org/vuln/CVE-2016-9844
debian not yet assigned CVE-2016-9844 not yet assigned priority: Debian including 1 source packages (unzip), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2016-9844
redhat low — https://access.redhat.com/security/cve/CVE-2016-9844
suse medium — https://www.suse.com/security/cve/CVE-2016-9844/
ubuntu negligible CVE-2016-9844 negligible priority: Ubuntu including 1 source packages (unzip), 13 status rows across 13 suites (artful, bionic, cosmic, disco, eoan, focal, groovy, precise, trusty, upstream, xenial, yakkety, zesty): not-affected 6, ignored 4, released 3. https://ubuntu.com/security/CVE-2016-9844

Affected software / configurations for CVE-2016-9844

Vendor Product Version Raw CPE
unzip_project unzip 6.0 cpe:2.3:a:unzip_project:unzip:6.0:*:*:*:*:*:*:*

References for CVE-2016-9844

cvelogic Threat Intelligence