How severe is CVE-2018-11657?

CVE-2018-11657 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2018-11657 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-11657?

CVE-2018-11657 affects Miniupnp Project Ngiflib. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-11657?

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-2018-11657 published?

CVE-2018-11657 was published on 2018-06-01 and last updated on 2026-06-17.

CVE-2018-11657

CVE-2018-11657 is a high-severity vulnerability in Miniupnp Project Ngiflib with a CVSS 3.x base score of 7.5. 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-835.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (61st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-835
Affected product: Miniupnp Project Ngiflib
Published: 2018-06-01
Last modified: 2026-06-17

Description

ngiflib.c in MiniUPnP ngiflib 0.4 has an infinite loop in DecodeGifImg and LoadGif.

Frequently asked questions

What is CVE-2018-11657?: ngiflib.c in MiniUPnP ngiflib 0.4 has an infinite loop in DecodeGifImg and LoadGif.
How severe is CVE-2018-11657?: CVE-2018-11657 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2018-11657 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-11657?: CVE-2018-11657 affects Miniupnp Project Ngiflib. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-11657?: 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-2018-11657 published?: CVE-2018-11657 was published on 2018-06-01 and last updated on 2026-06-17.

References

https://github.com/miniupnp/ngiflib/issues/7

Affected products (1)

cpe:2.3:a:miniupnp_project:ngiflib:0.4:*:*:*:*:*:*:*

More vulnerabilities in Miniupnp Project Ngiflib

CVE-2018-11576 — Critical (CVSS 9.8): ngiflib.c in MiniUPnP ngiflib 0.4 has a heap-based buffer over-read in GifIndexToTrueColor.
CVE-2018-11575 — Critical (CVSS 9.8): ngiflib.c in MiniUPnP ngiflib 0.4 has a stack-based buffer overflow in DecodeGifImg.
CVE-2021-36531 — High (CVSS 8.8): ngiflib 0.4 has a heap overflow in GetByte() at ngiflib.c:70 in NGIFLIB_NO_FILE mode, GetByte() reads memory buffer…
CVE-2021-36530 — High (CVSS 8.8): ngiflib 0.4 has a heap overflow in GetByteStr() at ngiflib.c:108 in NGIFLIB_NO_FILE mode, GetByteStr() copy memory…
CVE-2019-20219 — High (CVSS 8.8): ngiflib 0.4 has a heap-based buffer over-read in GifIndexToTrueColor in ngiflib.c.
CVE-2019-16347 — High (CVSS 8.8): ngiflib 0.4 has a heap-based buffer overflow in WritePixels() in ngiflib.c when called from DecodeGifImg, because…

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