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CVE-2015-7764

Lemur uses static IV per key

7.5 HighFix available

Lemur 0.1.4 does not use sufficient entropy in its IV when encrypting AES in CBC mode.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
None
Availability
None

Exploit likelihood

1.51%Up 0.6 points since Feb 4, 2022
90%50%10%1%

What each source reports

NVD Score used 7.5

Lemur 0.1.4 does not use sufficient entropy in its IV when encrypting AES in CBC mode.

Record
CVE-2015-7764
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS 2.0
5.0 MediumAV:N/AC:L/Au:N/C:P/I:N/A:N
Weakness
CWE-331
Updated
2026-11-02
CVE List No score

Lemur 0.1.4 does not use sufficient entropy in its IV when encrypting AES in CBC mode.

Record
CVE-2015-7764
Updated
2026-11-02
EUVDEUVD-2017-0069 No score

Lemur 0.1.4 does not use sufficient entropy in its IV when encrypting AES in CBC mode.

Record
EUVD-2017-0069
Updated
2026-11-03
GitHub AdvisoriesGHSA-chg9-3c3p-ch23 8.7

Lemur uses static IV per key

Lemur 0.1.4 does not use sufficient entropy in its IV when encrypting AES in CBC mode.

Record
GHSA-chg9-3c3p-ch23
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-331
Updated
2026-11-02
OSVGHSA-chg9-3c3p-ch23 8.7

Lemur uses static IV per key

Lemur 0.1.4 does not use sufficient entropy in its IV when encrypting AES in CBC mode.

Record
GHSA-chg9-3c3p-ch23
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-331
Updated
2026-11-02
OSVPYSEC-2017-50 No score

Lemur 0.1.4 does not use sufficient entropy in its IV when encrypting AES in CBC mode.

Record
PYSEC-2017-50
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
lemur
PyPI
 before 0.1.5
0.1.5
lemur
PyPI
 before 0.2.1
0.2.1

History

History
RecordedChangedSources
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2015-7764 is a high vulnerability (CVSS 7.5) in Netflix Lemur, published August 9, 2017. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.51%, the 74th percentile. Fixed in lemur 0.1.5.

References

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