CVE-2017-1000421

Gifsicle gifview 1.89 and older is vulnerable to a use-after-free in the read_gif function resulting potential code execution

Published: 2018-01-02 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2017-1000421 is rated High Risk (70.6/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 2.67%). EPSS rose +2.14% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

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-2017-1000421

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 0.52% 2.67% +2.14%
2 2025-03-30 1.39% 0.52% -0.87%
3 2025-03-29 — 1.39% —

Full EPSS history (13 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2017-1000421

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.0 CRITICAL
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
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:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]
7.5 2.0 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 6.4 [email protected]

Weakness enumeration for CVE-2017-1000421

OS Trackers for CVE-2017-1000421

vendor priority summary link
debian not yet assigned CVE-2017-1000421 not yet assigned priority: Debian including 1 source packages (gifsicle), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2017-1000421
ubuntu medium CVE-2017-1000421 medium priority: Ubuntu including 1 source packages (gifsicle), 14 status rows across 14 suites (artful, bionic, cosmic, disco, eoan, focal, groovy, hirsute, impish, jammy, trusty, upstream, xenial, zesty): not-affected 10, released 3, ignored 1. https://ubuntu.com/security/CVE-2017-1000421

Affected software / configurations for CVE-2017-1000421

Vendor Product Version Raw CPE
lcdf gifsicle <= 1.89 cpe:2.3:a:lcdf:gifsicle:*:*:*:*:*:*:*:*
debian debian_linux 7.0 cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*
debian debian_linux 8.0 cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
debian debian_linux 9.0 cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*

References for CVE-2017-1000421

URL Tags
https://github.com/kohler/gifsicle/issues/114 Issue Tracking Patch Third Party Advisory
https://lists.debian.org/debian-lts-announce/2018/01/msg00006.html Mailing List Third Party Advisory
https://www.debian.org/security/2018/dsa-4084 Third Party Advisory
cvelogic Threat Intelligence