CVE-2017-12373

mediumpriority · track · 38EPSS 0.128 · 96 %ileexploit · functionalEUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

1 exploit · functional

Likely / severe?

12.8% (96th) EPSS

CVSS 4.3 · medium

Is it mine?

6 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · nvd

EPSS · scored 2026-10-27

A vulnerability in the TLS protocol implementation of legacy Cisco ASA 5500 Series (ASA 5505, 5510, 5520, 5540, and 5550) devices could allow an unauthenticated, remote attacker to access sensitive information, aka a Return of Bleichenbacher's Oracle Threat (ROBOT) attack. An attacker could iteratively query a server running a vulnerable TLS stack implementation to perform cryptanalytic operations that may allow decryption of previously captured TLS sessions. Cisco Bug IDs: CSCvg97652.

cvss

Technical severity, 0–10. One row per scoring source.

5.9

010

base score 0–10 · higher = more severe · hover a vector to decode

v2.04.3mediumAV:N/AC:M/Au:N/C:P/I:N/A:Nprimary · NVD / NIST USexploitability 8.6 · impact 2.9

v3.05.9mediumCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:Nprimary · NVD / NIST USexploitability 2.2 · impact 3.6

v3.05.8mediumCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N/E:Fsecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-203USprimaryCWE-200US

exploits (1)

Public proof-of-concept and weaponised exploit code.

auxiliary/scanner/ssl/bleichenbacher_oracleScanner for Bleichenbacher Oracle in RSA PKCS #1 v1.5functional · metasploit

affected products (6)

Products and version ranges known to be affected.

n/a Cisco legacy ASA 5500 products TLS protocol implementation≤ Cisco legacy ASA 5500 products TLS protocol implementationenisa_euvdEU
cisco adaptive security appliance 5505 firmwareall versionsnvdUScpe:2.3:o:cisco:adaptive_security_appliance_5505_firmware:*:*:*:*:*:*:*:*
cisco adaptive security appliance 5510 firmwareall versionsnvdUScpe:2.3:o:cisco:adaptive_security_appliance_5510_firmware:*:*:*:*:*:*:*:*
cisco adaptive security appliance 5520 firmwareall versionsnvdUScpe:2.3:o:cisco:adaptive_security_appliance_5520_firmware:*:*:*:*:*:*:*:*
cisco adaptive security appliance 5540 firmwareall versionsnvdUScpe:2.3:o:cisco:adaptive_security_appliance_5540_firmware:*:*:*:*:*:*:*:*
cisco adaptive security appliance 5550 firmwareall versionsnvdUScpe:2.3:o:cisco:adaptive_security_appliance_5550_firmware:*:*:*:*:*:*:*:*

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd NVD CVE.org MITRE

published 2017-12-15modified 2026-06-17

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+881 more

references (7)

External citations — patches, advisories, analysis.

scry

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