How severe is CVE-2009-0363?

CVE-2009-0363 has a CVSS 2.0 base score of 7.5, rated high severity.

Is CVE-2009-0363 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-0363?

CVE-2009-0363 primarily affects Barnowl. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-0363?

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-2009-0363 published?

CVE-2009-0363 was published on 2009-02-17 and last updated on 2026-06-16.

CVE-2009-0363

CVE-2009-0363 is a high-severity vulnerability in Barnowl with a CVSS 2.0 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-119.

Key facts

Severity: High (CVSS 2.0 base score 7.5)
EPSS exploit prediction: 3% (87th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-119
Affected product: Barnowl
Published: 2009-02-17
Last modified: 2026-06-16

Description

Multiple buffer overflows in (a) BarnOwl before 1.0.5 and (b) owl 2.1.11 allow remote attackers to execute arbitrary code via vectors involving (1) a crafted zcrypt message, related to zcrypt.c; (2) a reply command on a message with a Zephyr Cc: list, related to zwrite.c; and unspecified other use of the products.

Frequently asked questions

What is CVE-2009-0363?: Multiple buffer overflows in (a) BarnOwl before 1.0.5 and (b) owl 2.1.11 allow remote attackers to execute arbitrary code via vectors involving (1) a crafted zcrypt message, related to zcrypt.c; (2) a reply command on a message with a Zephyr Cc: list, related to zwrite.c; and unspecified other use of the products.
How severe is CVE-2009-0363?: CVE-2009-0363 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2009-0363 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-0363?: CVE-2009-0363 primarily affects Barnowl. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2009-0363?: 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-2009-0363 published?: CVE-2009-0363 was published on 2009-02-17 and last updated on 2026-06-16.

References

Affected products (8)

cpe:2.3:a:barnowl:barnowl:*:*:*:*:*:*:*:*
cpe:2.3:a:barnowl:barnowl:1.0.0:*:*:*:*:*:*:*
cpe:2.3:a:barnowl:barnowl:1.0.1:*:*:*:*:*:*:*
cpe:2.3:a:barnowl:barnowl:1.0.2:*:*:*:*:*:*:*
cpe:2.3:a:barnowl:barnowl:1.0.2.1:*:*:*:*:*:*:*
cpe:2.3:a:barnowl:barnowl:1.0.3:*:*:*:*:*:*:*
cpe:2.3:a:barnowl:barnowl:1.0.4:*:*:*:*:*:*:*
cpe:2.3:a:ktools:owl:2.1.11:*:*:*:*:*:*:*

More vulnerabilities in Barnowl

CVE-2010-2725 — High (CVSS 7.5): BarnOwl before 1.6.2 does not check the return code of calls to the (1) ZPending and (2) ZReceiveNotice functions in…
CVE-2010-0793 — High (CVSS 7.5): Buffer overflow in BarnOwl before 1.5.1 allows remote attackers to cause a denial of service (crash) and possibly…

All CVEs affecting Barnowl →

Other CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) vulnerabilities

CVE-2026-2778 — Critical (CVSS 10.0): Sandbox escape due to incorrect boundary conditions in the DOM: Core & HTML component. This vulnerability was fixed in…
CVE-2026-2776 — Critical (CVSS 10.0): Sandbox escape due to incorrect boundary conditions in the Telemetry component in External Software. This vulnerability…
CVE-2025-1866 — Critical (CVSS 10.0): Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in warmcat libwebsockets allows…
CVE-2022-27625 — Critical (CVSS 10.0): A vulnerability regarding improper restriction of operations within the bounds of a memory buffer is found in the…
CVE-2022-27624 — Critical (CVSS 10.0): A vulnerability regarding improper restriction of operations within the bounds of a memory buffer is found in the…
CVE-2020-11896 — Critical (CVSS 10.0): The Treck TCP/IP stack before 6.0.1.66 allows Remote Code Execution, related to IPv4 tunneling.

Browse all CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) vulnerabilities →