How severe is CVE-2023-34366?

CVE-2023-34366 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-2023-34366 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-34366?

CVE-2023-34366 primarily affects Justsystems Easy Postcard Max. In total, 19 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2023-34366?

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-2023-34366 published?

CVE-2023-34366 was published on 2023-10-19 and last updated on 2026-06-17.

CVE-2023-34366

CVE-2023-34366 is a high-severity vulnerability in Justsystems Easy Postcard Max 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-416.

Key facts

Severity: High (CVSS 3.x base score 7.8)
EPSS exploit prediction: 1% (46th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-416
Affected product: Justsystems Easy Postcard Max
Published: 2023-10-19
Last modified: 2026-06-17

Description

A use-after-free vulnerability exists in the Figure stream parsing functionality of Ichitaro 2023 1.0.1.59372. A specially crafted document can cause memory corruption, resulting in arbitrary code execution. Victim would need to open a malicious file to trigger this vulnerability.

Frequently asked questions

What is CVE-2023-34366?: A use-after-free vulnerability exists in the Figure stream parsing functionality of Ichitaro 2023 1.0.1.59372. A specially crafted document can cause memory corruption, resulting in arbitrary code execution. Victim would need to open a malicious file to trigger this vulnerability.
How severe is CVE-2023-34366?: CVE-2023-34366 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-2023-34366 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-34366?: CVE-2023-34366 primarily affects Justsystems Easy Postcard Max. In total, 19 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2023-34366?: 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-2023-34366 published?: CVE-2023-34366 was published on 2023-10-19 and last updated on 2026-06-17.

References

Affected products (19)

cpe:2.3:a:justsystems:easy_postcard_max:-:*:*:*:*:*:*:*
cpe:2.3:a:justsystems:ichitaro_2021:-:*:*:*:*:*:*:*
cpe:2.3:a:justsystems:ichitaro_2022:-:*:*:*:*:*:*:*
cpe:2.3:a:justsystems:ichitaro_2023:1.0.1.59372:*:*:*:*:*:*:*
cpe:2.3:a:justsystems:ichitaro_government_10:-:*:*:*:*:*:*:*
cpe:2.3:a:justsystems:ichitaro_government_8:-:*:*:*:*:*:*:*
cpe:2.3:a:justsystems:ichitaro_government_9:-:*:*:*:*:*:*:*
cpe:2.3:a:justsystems:ichitaro_pro_3:-:*:*:*:*:*:*:*
cpe:2.3:a:justsystems:ichitaro_pro_4:-:*:*:*:*:*:*:*
cpe:2.3:a:justsystems:ichitaro_pro_5:-:*:*:*:*:*:*:*
cpe:2.3:a:justsystems:just_government_3:-:*:*:*:*:*:*:*
cpe:2.3:a:justsystems:just_government_4:-:*:*:*:*:*:*:*
cpe:2.3:a:justsystems:just_government_5:-:*:*:*:*:*:*:*
cpe:2.3:a:justsystems:just_office_3:-:*:*:*:*:*:*:*
cpe:2.3:a:justsystems:just_office_4:-:*:*:*:*:*:*:*
cpe:2.3:a:justsystems:just_office_5:-:*:*:*:*:*:*:*
cpe:2.3:a:justsystems:just_police_3:-:*:*:*:*:*:*:*
cpe:2.3:a:justsystems:just_police_4:-:*:*:*:*:*:*:*
cpe:2.3:a:justsystems:just_police_5:-:*:*:*:*:*:*:*

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