CVE-2016-1494
The verify function in the RSA package for Python (Python-RSA) before 3.3 allows attackers to spoof signatures with a small public exponent via crafted signature padding, aka a BERserk attack.
02 Description
The verify function in the RSA package for Python (Python-RSA) before 3.3 allows attackers to spoof signatures with a small public exponent via crafted signature padding, aka a BERserk attack.
03 Exploitation and scoring
- Exploitation
- Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
- SSVC decision
- Not assessed by CISA
- EPSS probability
- 7.05% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 93.9% of scored records. A rank, not a probability.
- NVD base score
- 5.3 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- NVD analysis status
- Modified. NVD last modified this record on 2026-06-17.
- Red Hat severity
- No Red Hat rating. Red Hat rates the CVEs that affect its products.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2016-01-13 15:00Z10 YR AGO
- Last updated
- 2024-08-05 22:55Z2 YR AGO
- Reserved
- 2016-01-04
- Assigning CNA
- mitre
- Record state
- PUBLISHED
- Severity
- Not rated by the issuing CNA
- CNA CVSS vector
- Not published by the issuing CNA
- Weaknesses
- CWE-20Improper Input ValidationClass
- Data version
- 5.1
- Document digest
- 239f8fcea54f43c33570aa1a6e7b21a13b17ead6f56a21310d4cbfb0b55faec1
05 Affected products
06 References
- www.openwall.com[oss-security] 20160104 Re: CVE Request: python-rsa signature forgeryhttp://www.openwall.com/lists/oss-security/2016/01/05/3
- www.securityfocus.com79829http://www.securityfocus.com/bid/79829
- blog.filippo.iohttps://blog.filippo.io/bleichenbacher-06-signature-forgery-in-python-rsa/
- www.openwall.com[oss-security] 20160105 CVE Request: python-rsa signature forgeryhttp://www.openwall.com/lists/oss-security/2016/01/05/1
- lists.fedoraproject.orgFEDORA-2016-70edfbbcefhttp://lists.fedoraproject.org/pipermail/package-announce/2016-January/175897.html
- lists.opensuse.orgopenSUSE-SU-2016:0108http://lists.opensuse.org/opensuse-updates/2016-01/msg00032.html
- bitbucket.orghttps://bitbucket.org/sybren/python-rsa/pull-requests/14/security-fix-bb06-attack-in-verify-by/diff
- lists.fedoraproject.orgFEDORA-2016-c845706426http://lists.fedoraproject.org/pipermail/package-announce/2016-January/175942.html
07 Fixed in
Debian 12
- python-rsa Fixed in 3.2.3-1.1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- python-rsa Fixed in 3.2.3-1.1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- python-rsa Fixed in 3.2.3-1.1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 14.04 LTS
- python-rsa Fixed in 3.1.2-1ubuntu0.1
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.