How severe is CVE-2011-1956?

CVE-2011-1956 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2011-1956 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 6% (92nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-1956?

CVE-2011-1956 affects Wireshark. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2011-1956?

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

When was CVE-2011-1956 published?

CVE-2011-1956 was published on 2011-06-06 and last updated on 2026-06-16.

CVE-2011-1956

CVE-2011-1956 is a medium-severity vulnerability in Wireshark with a CVSS 2.0 base score of 4.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 2.0 base score 4.3)
EPSS exploit prediction: 6% (92nd percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Wireshark
Published: 2011-06-06
Last modified: 2026-06-16

Description

The bytes_repr_len function in Wireshark 1.4.5 uses an incorrect pointer argument, which allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) via arbitrary TCP traffic.

Frequently asked questions

What is CVE-2011-1956?: The bytes_repr_len function in Wireshark 1.4.5 uses an incorrect pointer argument, which allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) via arbitrary TCP traffic.
How severe is CVE-2011-1956?: CVE-2011-1956 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2011-1956 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 6% (92nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-1956?: CVE-2011-1956 affects Wireshark. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2011-1956?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2011-1956 published?: CVE-2011-1956 was published on 2011-06-06 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:wireshark:wireshark:1.4.5:*:*:*:*:*:*:*

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