How severe is CVE-2020-35133?

CVE-2020-35133 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-2020-35133 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (90th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-35133?

CVE-2020-35133 affects Irfanview. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-35133?

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-2020-35133 published?

CVE-2020-35133 was published on 2020-12-16 and last updated on 2026-06-17.

CVE-2020-35133

CVE-2020-35133 is a high-severity vulnerability in Irfanview 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-434.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 4% (90th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-434
Affected product: Irfanview
Published: 2020-12-16
Last modified: 2026-06-17

Description

irfanView 4.56 contains an error processing parsing files of type .pcx. Which leads to out-of-bounds writing at i_view32+0xdb60.

Frequently asked questions

What is CVE-2020-35133?: irfanView 4.56 contains an error processing parsing files of type .pcx. Which leads to out-of-bounds writing at i_view32+0xdb60.
How severe is CVE-2020-35133?: CVE-2020-35133 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-2020-35133 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (90th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-35133?: CVE-2020-35133 affects Irfanview. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-35133?: 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-2020-35133 published?: CVE-2020-35133 was published on 2020-12-16 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:irfanview:irfanview:4.56:*:*:*:*:*:*:*

More vulnerabilities in Irfanview

CVE-2007-1867 — Critical (CVSS 10.0): Buffer overflow in IrfanView 3.99 allows remote attackers to execute arbitrary code via a crafted animated cursor (ANI)…
CVE-2008-0493 — Critical (CVSS 9.3): fpx.dll 3.9.8.0 in the FlashPix plugin for IrfanView 4.10 allows remote attackers to execute arbitrary code via a…
CVE-2007-1948 — Critical (CVSS 9.3): Buffer overflow in IrfanView 3.99 allows context-dependent attackers to cause a denial of service and possibly execute…
CVE-2020-13905 — High (CVSS 8.8): IrfanView 4.54 allows a user-mode write access violation starting at FORMATS!GetPlugInInfo+0x0000000000038ed4.
CVE-2017-2813 — High (CVSS 8.8): An exploitable integer overflow vulnerability exists in the JPEG 2000 parser functionality of IrfanView 4.44. A…
CVE-2007-2363 — High (CVSS 8.5): Buffer overflow in IrfanView 4.00 and earlier allows user-assisted remote attackers to execute arbitrary code via a…

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