How severe is CVE-2020-24221?

CVE-2020-24221 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2020-24221 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-24221?

CVE-2020-24221 affects Miniupnp Project Ngiflib. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-24221?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2020-24221 published?

CVE-2020-24221 was published on 2023-08-11 and last updated on 2026-06-17.

CVE-2020-24221

CVE-2020-24221 is a medium-severity vulnerability in Miniupnp Project Ngiflib with a CVSS 3.x base score of 5.5. 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: Medium (CVSS 3.x base score 5.5)
EPSS exploit prediction: 0% (21st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-835
Affected product: Miniupnp Project Ngiflib
Published: 2023-08-11
Last modified: 2026-06-17

Description

An issue was discovered in GetByte function in miniupnp ngiflib version 0.4, allows local attackers to cause a denial of service (DoS) via crafted .gif file (infinite loop).

Frequently asked questions

What is CVE-2020-24221?: An issue was discovered in GetByte function in miniupnp ngiflib version 0.4, allows local attackers to cause a denial of service (DoS) via crafted .gif file (infinite loop).
How severe is CVE-2020-24221?: CVE-2020-24221 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2020-24221 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-24221?: CVE-2020-24221 affects Miniupnp Project Ngiflib. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-24221?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-24221 published?: CVE-2020-24221 was published on 2023-08-11 and last updated on 2026-06-17.

References

https://github.com/miniupnp/ngiflib/issues/17

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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