Is CVE-2016-3977 in the CISA KEV catalog?

No. CVE-2016-3977 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2016-3977?

CVE-2016-3977 has a CVSS v3 base score of 5.5 (MEDIUM).

What is the EPSS score for CVE-2016-3977?

CVE-2016-3977 has an EPSS score of 2.11% (80th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2016-3977?

Upgrade giflib on debian 11 to 5.1.4-3 or later. Fixes are available for 4 affected products.

CVE & CISA-KEV Catalog

CVE-2016-3977

MEDIUMEPSS 80th pctl

5.5

CVSS v3

NVD

Description

Heap-based buffer overflow in util/gif2rgb.c in gif2rgb in giflib 5.1.2 allows remote attackers to cause a denial of service (application crash) via the background color index in a GIF file.

CWE-119Buffer Overflow

How to fix

Remediation Available

giflibDebian

Fixed in:5.1.4-3CVE-2016-3977

giflibUbuntu

Fixed in:5.1.4-0.3~16.04.1USN-4107-1

Fixed in:5.1.4-2ubuntu0.1USN-4107-1

giflib-toolsUbuntu

Fixed in:5.1.4-0.3~16.04.1USN-4107-1

Fixed in:5.1.4-2ubuntu0.1USN-4107-1

libgif7Ubuntu

Fixed in:5.1.4-0.3~16.04.1USN-4107-1

Fixed in:5.1.4-2ubuntu0.1USN-4107-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Exploit Intelligence

2.11%probability of exploitation in 30 days

80thpercentile

Elevated risk: more likely to be exploited than 80% of all known CVEs.

References

Patch2

Other references7

Related Vulnerabilities

Other CWE-119 (Buffer Overflow) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-4966	Critical	9.4	100%	KEV + Ransom	Fix
CVE-2017-11882	High	7.8	100%	KEV + Ransom	-
CVE-2020-0796	Critical	10.0	100%	KEV + Ransom	-
CVE-2008-4250	Critical	9.8	99%	KEV	-
CVE-2017-15944	Critical	9.8	98%	KEV	Fix
CVE-2015-0014	High	10.0	97%	-	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-06.