CVE-2015-7506

The gif_next_LZW function in libnsgif.c in Libnsgif 0.1.2 allows context-dependent attackers to cause a denial of service (out-of-bounds read and application crash) via a crafted LZW stream in a GIF file.

Published: 2020-02-18 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2015-7506 is rated Moderate Risk (46.9/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 0.43%). Review affected assets and schedule 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-2015-7506

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 2025-03-30 0.52% 0.43% -0.08%
2 2025-03-29 0.43% 0.52% +0.08%
3 2025-03-17 — 0.43% —

Full EPSS history (5 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2015-7506

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.5 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/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:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
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:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 3.6 [email protected]
4.3 2.0 MEDIUM
AV:N/AC:M/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
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.
 8.6 2.9 [email protected]

Weakness enumeration for CVE-2015-7506

OS Trackers for CVE-2015-7506

vendor priority summary link
debian not yet assigned CVE-2015-7506 not yet assigned priority: Debian including 1 source packages (netsurf), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2015-7506
ubuntu medium CVE-2015-7506 medium priority: Ubuntu including 1 source packages (libnsgif), 12 status rows across 12 suites (artful, bionic, cosmic, disco, precise, trusty, upstream, vivid, wily, xenial, yakkety, zesty): DNE 8, ignored 3, needs-triage 1. https://ubuntu.com/security/CVE-2015-7506

Affected software / configurations for CVE-2015-7506

Vendor Product Version Raw CPE
netsurf-browser libnsgif 0.1.2 cpe:2.3:a:netsurf-browser:libnsgif:0.1.2:*:*:*:*:*:*:*

References for CVE-2015-7506

URL Tags
http://seclists.org/fulldisclosure/2015/Dec/70 Mailing List Third Party Advisory
cvelogic Threat Intelligence