CVE-2017-13099 | wolfSSL Bleichenbacher/ROBOT

wolfSSL prior to version 3.12.2 provides a weak Bleichenbacher oracle when any TLS cipher suite using RSA key exchange is negotiated. An attacker can recover the private key from a vulnerable wolfSSL application. This vulnerability is referred to as "ROBOT."

Published: 2017-12-13 Last update: 2026-05-13 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2017-13099 is rated Moderate Risk (62.8/100): CVSS High severity, with high exploitation likelihood (EPSS 76.91%, 99th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2017-13099

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-05-28 78.71% 76.91% -1.80%
2 2026-04-12 78.46% 78.71% +0.25%
3 2026-03-17 — 78.46% —

Full EPSS history (49 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2017-13099

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.0 HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 3.6 [email protected]
5.9 3.0 MEDIUM
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 2.2 3.6 [email protected]
4.3 2.0 MEDIUM
AV:N/AC:M/Au:N/C:P/I:N/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 8.6 2.9 [email protected]

Weakness enumeration for CVE-2017-13099

OS Trackers for CVE-2017-13099

vendor priority summary link
debian not yet assigned CVE-2017-13099 not yet assigned priority: Debian including 1 source packages (wolfssl), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2017-13099
ubuntu medium CVE-2017-13099 medium priority: Ubuntu including 1 source packages (wolfssl), 21 status rows across 21 suites (artful, bionic, cosmic, disco, eoan, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial, zesty): not-affected 16, ignored 2, DNE 1, needed 1, released 1. https://ubuntu.com/security/CVE-2017-13099

Affected software / configurations for CVE-2017-13099

Vendor Product Version Raw CPE
wolfssl wolfssl < 3.12.2 cpe:2.3:a:wolfssl:wolfssl:*:*:*:*:*:*:*:*
siemens scalance_w1750d_firmware < 8.3.0.1 cpe:2.3:o:siemens:scalance_w1750d_firmware:*:*:*:*:*:*:*:*
arubanetworks instant < 6.5.4.6 cpe:2.3:a:arubanetworks:instant:*:*:*:*:*:*:*:*

References for CVE-2017-13099

URL Tags
http://www.arubanetworks.com/assets/alert/ARUBA-PSA-2018-002.txt Third Party Advisory
http://www.kb.cert.org/vuls/id/144389 Issue Tracking Mitigation Third Party Advisory US Government Resource
http://www.securityfocus.com/bid/102174 Issue Tracking Mitigation Third Party Advisory VDB Entry
https://cert-portal.siemens.com/productcert/pdf/ssa-464260.pdf Third Party Advisory
https://github.com/wolfSSL/wolfssl/pull/1229 Issue Tracking Patch Third Party Advisory
https://robotattack.org/ Issue Tracking Third Party Advisory
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