How severe is CVE-2015-2311?

CVE-2015-2311 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2015-2311 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2015-2311?

CVE-2015-2311 primarily affects Capnproto. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2015-2311?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2015-2311 published?

CVE-2015-2311 was published on 2017-08-09 and last updated on 2026-06-17.

CVE-2015-2311

CVE-2015-2311 is a critical-severity vulnerability in Capnproto with a CVSS 3.x base score of 9.8. 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-191.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 3% (83rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-191
Affected product: Capnproto
Published: 2017-08-09
Last modified: 2026-06-17

Description

Integer underflow in Sandstorm Cap'n Proto before 0.4.1.1 and 0.5.x before 0.5.1.1 might allow remote peers to cause a denial of service or possibly obtain sensitive information from memory or execute arbitrary code via a crafted message.

Frequently asked questions

What is CVE-2015-2311?: Integer underflow in Sandstorm Cap'n Proto before 0.4.1.1 and 0.5.x before 0.5.1.1 might allow remote peers to cause a denial of service or possibly obtain sensitive information from memory or execute arbitrary code via a crafted message.
How severe is CVE-2015-2311?: CVE-2015-2311 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2015-2311 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2015-2311?: CVE-2015-2311 primarily affects Capnproto. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2015-2311?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2015-2311 published?: CVE-2015-2311 was published on 2017-08-09 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:a:capnproto:capnproto:*:*:*:*:*:*:*:*
cpe:2.3:a:capnproto:capnproto:0.5.0.0:*:*:*:*:*:*:*
cpe:2.3:a:capnproto:capnproto:0.5.1.0:*:*:*:*:*:*:*

More vulnerabilities in Capnproto

CVE-2015-2310 — Critical (CVSS 9.1): Integer overflow in layout.c++ in Sandstorm Cap'n Proto before 0.4.1.1 and 0.5.x before 0.5.1.1 allows remote peers to…
CVE-2015-2313 — High (CVSS 7.5): Sandstorm Cap'n Proto before 0.4.1.1 and 0.5.x before 0.5.1.2, when an application invokes the totalSize method on an…
CVE-2015-2312 — High (CVSS 7.5): Sandstorm Cap'n Proto before 0.4.1.1 and 0.5.x before 0.5.1.1 allows remote peers to cause a denial of service (CPU and…
CVE-2017-7892 — High (CVSS 7.5): Sandstorm Cap'n Proto before 0.5.3.1 allows remote crashes related to a compiler optimization. A remote attacker can…
CVE-2026-32240 — Medium (CVSS 6.5): Cap'n Proto is a data interchange format and capability-based RPC system. Prior to 1.4.0, when using Transfer-Encoding:…
CVE-2026-32239 — Medium (CVSS 6.5): Cap'n Proto is a data interchange format and capability-based RPC system. Prior to 1.4.0, a negative Content-Length…

All CVEs affecting Capnproto →

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