CVE-2015-7505Public exploitNetwork attack vector

Application crash via unbounded LZW stack writes

Published Feb 18, 2020 · Updated Aug 6, 2024

Stack-based buffer overflow in NetSurf Libnsgif 0.1.2 allows context-dependent attackers to crash applications via a crafted GIF. In gif_next_LZW in libnsgif.c, malformed LZW codes keep stack_pointer advancing through a fixed-size decode stack without an effective bounds check. A consuming application must decode the supplied image; the demonstrated result is a crash, while the CVE record lists arbitrary code execution without a successful execution demonstration.

CVSS severity8.8
High
EPSS probability3.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in NetSurf Libnsgif 0.1.2 allows context-dependent attackers to crash applications via a crafted GIF. In gif_next_LZW in libnsgif.c, malformed LZW codes keep stack_pointer advancing through a fixed-size decode stack without an effective bounds check. A consuming application must decode the supplied image; the demonstrated result is a crash, while the CVE record lists arbitrary code execution without a successful execution demonstration.

The record

CVE
CVE-2015-7505
Published
Feb 18, 2020
Updated
Aug 6, 2024
Vendor
NetSurf
Product
Libnsgif
Classifications
CWE-787, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 18, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 6, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0.1.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

NetSurf · Libnsgifversion=0.1.2

Published CVSS scores

6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P
8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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