How severe is CVE-2015-3278?

CVE-2015-3278 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-2015-3278 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (71st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2015-3278?

CVE-2015-3278 affects Nss Compat Ossl Project Nss Compat Ossl. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2015-3278?

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-2015-3278 published?

CVE-2015-3278 was published on 2017-07-25 and last updated on 2026-06-17.

CVE-2015-3278

CVE-2015-3278 is a critical-severity vulnerability in Nss Compat Ossl Project Nss Compat Ossl 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-20.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 2% (71st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Nss Compat Ossl Project Nss Compat Ossl
Published: 2017-07-25
Last modified: 2026-06-17

Description

The cipherstring parsing code in nss_compat_ossl while in multi-keyword mode does not match the expected set of ciphers for a given cipher combination, which allows attackers to have unspecified impact via unknown vectors.

Frequently asked questions

What is CVE-2015-3278?: The cipherstring parsing code in nss_compat_ossl while in multi-keyword mode does not match the expected set of ciphers for a given cipher combination, which allows attackers to have unspecified impact via unknown vectors.
How severe is CVE-2015-3278?: CVE-2015-3278 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-2015-3278 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (71st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2015-3278?: CVE-2015-3278 affects Nss Compat Ossl Project Nss Compat Ossl. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2015-3278?: 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-2015-3278 published?: CVE-2015-3278 was published on 2017-07-25 and last updated on 2026-06-17.

References

https://bugzilla.redhat.com/show_bug.cgi?id=1238326

Affected products (1)

cpe:2.3:a:nss_compat_ossl_project:nss_compat_ossl:-:*:*:*:*:*:*:*

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