How severe is CVE-2017-18120?

CVE-2017-18120 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2017-18120 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-18120?

CVE-2017-18120 affects Lcdf Gifsicle. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2017-18120?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2017-18120 published?

CVE-2017-18120 was published on 2018-02-02 and last updated on 2026-06-17.

CVE-2017-18120

CVE-2017-18120 is a high-severity vulnerability in Lcdf Gifsicle with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-415.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v2: 6.8
EPSS exploit prediction: 2% (76th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-415
Affected product: Lcdf Gifsicle
Published: 2018-02-02
Last modified: 2026-06-17

Description

A double-free bug in the read_gif function in gifread.c in gifsicle 1.90 allows a remote attacker to cause a denial-of-service attack or unspecified other impact via a maliciously crafted file, because last_name is mishandled, a different vulnerability than CVE-2017-1000421.

Frequently asked questions

What is CVE-2017-18120?: A double-free bug in the read_gif function in gifread.c in gifsicle 1.90 allows a remote attacker to cause a denial-of-service attack or unspecified other impact via a maliciously crafted file, because last_name is mishandled, a different vulnerability than CVE-2017-1000421.
How severe is CVE-2017-18120?: CVE-2017-18120 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2017-18120 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-18120?: CVE-2017-18120 affects Lcdf Gifsicle. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2017-18120?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2017-18120 published?: CVE-2017-18120 was published on 2018-02-02 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:lcdf:gifsicle:1.90:*:*:*:*:*:*:*

More vulnerabilities in Lcdf Gifsicle

CVE-2017-1000421 — Critical (CVSS 9.8): Gifsicle gifview 1.89 and older is vulnerable to a use-after-free in the read_gif function resulting potential code…
CVE-2023-46009 — High (CVSS 7.8): gifsicle-1.94 was found to have a floating point exception (FPE) vulnerability via resize_stream at src/xform.c.
CVE-2023-36193 — High (CVSS 7.8): Gifsicle v1.9.3 was discovered to contain a heap buffer overflow via the ambiguity_error component at /src/clp.c.
CVE-2020-19752 — High (CVSS 7.5): The find_color_or_error function in gifsicle 1.92 contains a NULL pointer dereference.
CVE-2023-44821 — Medium (CVSS 5.5): Gifsicle through 1.94, if deployed in a way that allows untrusted input to affect Gif_Realloc calls, might allow a…

All CVEs affecting Lcdf Gifsicle →

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CVE-2020-37239 — Critical (CVSS 9.8): libbabl 0.1.62 contains a broken double free detection vulnerability that allows attackers to bypass memory safety…
CVE-2026-43011 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: net/x25: Fix potential double free of skb When…
CVE-2026-31609 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: smb: client: avoid double-free in…
CVE-2026-31608 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: smb: server: avoid double-free in…

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