How severe is CVE-2015-4334?

CVE-2015-4334 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2015-4334 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-2015-4334?

CVE-2015-4334 affects Symantec Proxysg Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2015-4334?

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

When was CVE-2015-4334 published?

CVE-2015-4334 was published on 2015-12-07 and last updated on 2026-06-17.

CVE-2015-4334

CVE-2015-4334 is a medium-severity vulnerability in Symantec Proxysg Firmware with a CVSS 2.0 base score of 5.0. 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-200.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 3% (87th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-200
Affected product: Symantec Proxysg Firmware
Published: 2015-12-07
Last modified: 2026-06-17

Description

The default configuration of SGOS in Blue Coat ProxySG before 6.2.16.5, 6.5 before 6.5.7.1, and 6.6 before 6.6.2.1 forwards authentication challenges from upstream origin content servers (OCS) when used in an explicit proxy deployment, which makes it easier for remote attackers to obtain sensitive information via a 407 (aka Proxy Authentication Required) HTTP status code, as demonstrated when using NTLM authentication.

Frequently asked questions

What is CVE-2015-4334?: The default configuration of SGOS in Blue Coat ProxySG before 6.2.16.5, 6.5 before 6.5.7.1, and 6.6 before 6.6.2.1 forwards authentication challenges from upstream origin content servers (OCS) when used in an explicit proxy deployment, which makes it easier for remote attackers to obtain sensitive information via a 407 (aka Proxy Authentication Required) HTTP status code, as demonstrated when using NTLM authentication.
How severe is CVE-2015-4334?: CVE-2015-4334 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2015-4334 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-2015-4334?: CVE-2015-4334 affects Symantec Proxysg Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2015-4334?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2015-4334 published?: CVE-2015-4334 was published on 2015-12-07 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:symantec:proxysg_firmware:*:*:*:*:*:*:*:*

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