How severe is CVE-2016-6286?

CVE-2016-6286 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 high, and availability none.

Is CVE-2016-6286 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (71st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-6286?

CVE-2016-6286 affects Call-cc Http-client. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2016-6286?

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-2016-6286 published?

CVE-2016-6286 was published on 2017-01-10 and last updated on 2026-06-17.

CVE-2016-6286

CVE-2016-6286 is a high-severity vulnerability in Call-cc Http-client 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-19.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (71st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-19
Affected product: Call-cc Http-client
Published: 2017-01-10
Last modified: 2026-06-17

Description

The "spiffy-cgi-handlers" egg would convert a nonexistent "Proxy" header to the HTTP_PROXY environment variable, which would allow attackers to direct CGI programs which use this environment variable to use an attacker-specified HTTP proxy server (also known as a "httpoxy" attack). This affects all versions of spiffy-cgi-handlers before 0.5.

Frequently asked questions

What is CVE-2016-6286?: The "spiffy-cgi-handlers" egg would convert a nonexistent "Proxy" header to the HTTP_PROXY environment variable, which would allow attackers to direct CGI programs which use this environment variable to use an attacker-specified HTTP proxy server (also known as a "httpoxy" attack). This affects all versions of spiffy-cgi-handlers before 0.5.
How severe is CVE-2016-6286?: CVE-2016-6286 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 high, and availability none.
Is CVE-2016-6286 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (71st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-6286?: CVE-2016-6286 affects Call-cc Http-client. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2016-6286?: 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-2016-6286 published?: CVE-2016-6286 was published on 2017-01-10 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:call-cc:http-client:*:*:*:*:*:*:*:*

More vulnerabilities in Call-cc Http-client

CVE-2016-6287 — High (CVSS 7.5): The "http-client" egg always used a HTTP_PROXY environment variable to determine whether HTTP traffic should be routed…

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