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Vulnerabilities

Vulnerability · CVE-2015-7575

Mozilla Network Security Services (NSS) before 3.20.2, as used in Mozilla Firefox before 43.0.2 and Firefox ESR 38.x before 38.5.2, does not reject MD5 signatures in Server Key Exc

Published Jan 9, 2016 · catalog updated Oct 15, 2026 · Mozilla

Check if you run it

No confirmed exploitation is on record for CVE-2015-7575. EPSS is 2.90%. Act only if a listed version of Mozilla is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium5.9
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
2.90%
Remediation
Advisory link
Affected products
Debian:12 gnutls28 · Debian:12 nss · Debian:12 openssl · Debian:13 gnutls28 · Debian:13 nss · Debian:13 openssl

Mozilla Network Security Services (NSS) before 3.20.2, as used in Mozilla Firefox before 43.0.2 and Firefox ESR 38.x before 38.5.2, does not reject MD5 signatures in Server Key Exchange messages in TLS 1.2 Handshake Protocol traffic, which makes it easier for man-in-the-middle attackers to spoof servers by triggering a collision.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • Debian:12 gnutls280 → 3.3.15-1
  • Debian:12 nss0 → 2:3.21-1
  • Debian:12 openssl0 → 1.0.1f-1
  • Debian:13 gnutls280 → 3.3.15-1
  • Debian:13 nss0 → 2:3.21-1
  • Debian:13 openssl0 → 1.0.1f-1
  • Debian:14 gnutls280 → 3.3.15-1
  • Debian:14 nss0 → 2:3.21-1
  • Debian:14 openssl0 → 1.0.1f-1
  • cpe canonical/ubuntu linux14.04
  • cpe mozilla/firefox38.0
  • cpe mozilla/firefox38.0.1
  • cpe mozilla/firefox38.0.5
  • cpe mozilla/firefox38.1.0
  • cpe mozilla/network security servicesversion unspecified
  • cpe opensuse/leap42.1
  • cpe opensuse/opensuse13.1
  • cpe opensuse/opensuse13.2
  • vendor n/a n/aversion unspecified

How to fix CVE-2015-7575

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2015-7575. EPSS is 2.90%. Act only if a listed version of Mozilla is installed.

Which versions are affected?

Compare what you have installed with canonical/ubuntu linux 14.04. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-19. EPSS 2.90%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Debian security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Jan 9, 2016 · NIST NVD

    Detected

    Mozilla Network Security Services (NSS) before 3.20.2, as used in Mozilla Firefox before 43.0.2 and Firefox ESR 38.x before 38.5.2, does not reject MD5 signatures in Server Key Exchange messages in TLS 1.2 Handshake Protocol traffic, which makes it easier for man-in-the-middle attackers to spoof servers by triggering a collision.

  2. Oct 14, 2026 · NIST NVD

    Updated

    Mozilla Network Security Services (NSS) before 3.20.2, as used in Mozilla Firefox before 43.0.2 and Firefox ESR 38.x before 38.5.2, does not reject MD5 signatures in Server Key Exchange messages in TLS 1.2 Handshake Protocol traffic, which makes it easier for man-in-the-middle attackers to spoof servers by triggering a collision.

  3. Oct 15, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    gnutls28 fixed in 3.3.15-1; gnutls28 fixed in 3.3.15-1; gnutls28 fixed in 3.3.15-1; nss fixed in 2:3.21-1

  4. Oct 15, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    gnutls28 fixed in 3.3.15-1

  5. Oct 15, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    nss fixed in 2:3.21-1

  6. Oct 15, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    openssl fixed in 1.0.1f-1

  7. Oct 15, 2026 · OpenSSF OSV / OSV Scanner

    Updated

    Mozilla Network Security Services (NSS) before 3.20.2, as used in Mozilla Firefox before 43.0.2 and Firefox ESR 38.x before 38.5.2, does not reject MD5 signatures in Server Key Exchange messages in TLS 1.2 Handshake Protocol traffic, which makes it easier for man-in-the-middle attackers to spoof servers by triggering a collision.

Sources

  • CIRCL Vulnerability LookupVulnerability recordCVE-2015-7575

    Mozilla Network Security Services (NSS) before 3.20.2, as used in Mozilla Firefox before 43.0.2 and Firefox ESR 38.x before 38.5.2, does not reject MD5 signatures in Server Key Exchange messages in TLS 1.2 Handshake Protocol traffic, which makes it easier for man-in-the-middle at

    vulnerability.circl.lu
  • CVE.orgVulnerability recordCVE-2015-7575

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2015-7575

    30-day exploitation probability 2.9%

    first.org
  • Mozilla Security AdvisoriesVendor advisoryCVE-2015-7575

    MD5 signatures accepted within TLS 1.2 ServerKeyExchange in server signature — Mozilla

    mozilla.org
  • NIST NVDVulnerability recordCVE-2015-7575

    Mozilla Network Security Services (NSS) before 3.20.2, as used in Mozilla Firefox before 43.0.2 and Firefox ESR 38.x before 38.5.2, does not reject MD5 signatures in Server Key Exchange messages in TLS 1.2 Handshake Protocol traffic, which makes it easier for man-in-the-middle at

    nvd.nist.gov
  • OpenSSF OSV / OSV ScannerPackage advisoryDEBIAN-CVE-2015-7575
    osv.dev

References

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.