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Full vulnerability report · 2018
CVE-2016-10708High confidence

n/a: NULL Pointer Dereference

n/a · n/a

7.5HighCVSS 3.1
Recommended action
Within 7 days

High technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available
Direct vendor intelligence

Authoritative vendor CSAF and VEX advisories

Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.

1 current
SSA-676336 · CSAF 2.0 · revision 3 · interimSiemens ProductCERTSSA-676336: OpenSSH Vulnerabilities in SCALANCE X-200 and X-300/X408 Switches
104 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • SCALANCE X200-4P IRT (6GK5200-4AH00-2BA3)
  • SCALANCE X201-3P IRT (6GK5201-3BH00-2BA3)
  • SCALANCE X201-3P IRT PRO (6GK5201-3JR00-2BA6)
  • SCALANCE X202-2IRT (6GK5202-2BB00-2BA3)
  • SCALANCE X202-2P IRT (6GK5202-2BH00-2BA3)
  • SCALANCE X202-2P IRT PRO (6GK5202-2JR00-2BA6)
  • SCALANCE X204-2 (6GK5204-2BB10-2AA3)
  • SCALANCE X204-2FM (6GK5204-2BB11-2AA3)
  • SCALANCE X204-2LD (6GK5204-2BC10-2AA3)
  • SCALANCE X204-2LD TS (6GK5204-2BC10-2CA2)
  • SCALANCE X204-2TS (6GK5204-2BB10-2CA2)
  • SCALANCE X204IRT (6GK5204-0BA00-2BA3)
Summary
sshd in OpenSSH before 7.4 allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via an out-of-sequence NEWKEYS message, as demonstrated by Honggfuzz, related to kex.c and packet.c.
Remediation
Update to V5.5.2 or later version
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Select the national-authority views to include. The exact source language is shown on each matched advisory. Your choice is remembered on this device and encoded in the shareable URL.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2016-1707

No EUVD known-exploited evidence

ENISA has published the identifier mapping but no EUVD description has been stored yet.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
Not supplied in the stored EUVD record
Advisory evidence
No linked advisory details stored yet
Recommended actionWithin 7 days

High technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available
01

What, why and how

sshd in OpenSSH before 7.4 allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via an out-of-sequence NEWKEYS message, as demonstrated by Honggfuzz, related to kex.c and packet.c.

What

sshd in OpenSSH before 7.4 allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via an out-of-sequence NEWKEYS message, as demonstrated by Honggfuzz, related to kex.c and packet.c.

Why

The product dereferences a pointer that it expects to be valid but is NULL.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may disrupt the affected service.

What

sshd in OpenSSH before 7.4 allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via an out-of-sequence NEWKEYS message, as demonstrated by Honggfuzz, related to kex.c and packet.c.

Why

The product dereferences a pointer that it expects to be valid but is NULL.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may disrupt the affected service.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
a network path → NULL Pointer Dereference → disrupt the affected service
Attack surface
Network
Privileges required
None: unauthenticated exploitation is possible
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-476 ↗

CWE-476: NULL Pointer Dereference. The product dereferences a pointer that it expects to be valid but is NULL.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CNoneConfidentiality impact: No direct loss is represented by this metric.INoneIntegrity impact: No direct loss is represented by this metric.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
NetworkUnauthenticatedDenial of serviceCWE-476
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Patch available
Affected
SCALANCE X200-4P IRT (6GK5200-4AH00-2BA3); SCALANCE X201-3P IRT (6GK5201-3BH00-2BA3); SCALANCE X201-3P IRT PRO (6GK5201-3JR00-2BA6); SCALANCE X202-2IRT (6GK5202-2BB00-2BA3); SCALANCE X202-2P IRT (6GK5202-2BH00-2BA3); SCALANCE X202-2P IRT PRO (6GK5202-2JR00-2BA6); SCALANCE X204-2 (6GK5204-2BB10-2AA3); SCALANCE X204-2FM (6GK5204-2BB11-2AA3); SCALANCE X204-2LD (6GK5204-2BC10-2AA3); SCALANCE X204-2LD TS (6GK5204-2BC10-2CA2); SCALANCE X204-2TS (6GK5204-2BB10-2CA2); SCALANCE X204IRT (6GK5204-0BA00-2BA3); SCALANCE X204IRT PRO (6GK5204-0JA00-2BA6); SCALANCE X206-1 (6GK5206-1BB10-2AA3); SCALANCE X206-1LD (6GK5206-1BC10-2AA3); SCALANCE X208 (incl. SIPLUS NET variant); SCALANCE X208PRO (6GK5208-0HA10-2AA6); SCALANCE X212-2 (incl. SIPLUS NET variant); SCALANCE X212-2LD (6GK5212-2BC00-2AA3); SCALANCE X216 (6GK5216-0BA00-2AA3); SCALANCE X224 (6GK5224-0BA00-2AA3); SCALANCE X302-7 EEC (230V, coated) (6GK5302-7GD00-3GA3); SCALANCE X302-7 EEC (230V) (6GK5302-7GD00-3EA3); SCALANCE X302-7 EEC (24V, coated) (6GK5302-7GD00-1GA3); SCALANCE X302-7 EEC (24V) (6GK5302-7GD00-1EA3); SCALANCE X302-7 EEC (2x 230V, coated) (6GK5302-7GD00-4GA3); SCALANCE X302-7 EEC (2x 230V) (6GK5302-7GD00-4EA3); SCALANCE X302-7 EEC (2x 24V, coated) (6GK5302-7GD00-2GA3); SCALANCE X302-7 EEC (2x 24V) (6GK5302-7GD00-2EA3); SCALANCE X304-2FE (6GK5304-2BD00-2AA3); and 74 more
Fixed
An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
Action
Update to V5.5.2 or later version
Workaround
No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04

Evidence and provenance

Published 21 Jan 2018 · Last source change 29 Apr 2026, 14:33 UTC · CWE-476 · NULL Pointer Dereference

CVE recordCVE.org · 5.2
CVSS sourceCISA ADP
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-09-01
European sourceENISA EUVD · EUVD-2016-1707
Product sourceVendor CSAF · Siemens ProductCERT
Remediation sourceVendor CSAF · Siemens ProductCERT
CWE sourceCISA ADP
NVD statusNVD modified after enrichment

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates →
  1. Vendor guidanceAuthoritative vendor guidance changed from vendor advisory to authoritative remediation link · patch.
    Before
    vendor advisory
    After
    authoritative remediation link · patch
    af854a3a-2127-422b-91ae-364da2661108 ↗
  2. Affected versionsThe structured affected or fixed version information changed.
    Before
    n/a · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    After
    n/a · Fixed: An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
    CNA ↗
  3. Remediation statusRemediation status changed from Awaiting fix to Patch available.
    Before
    Awaiting fix
    After
    Patch available
    af854a3a-2127-422b-91ae-364da2661108 ↗
  4. ENISA EUVD mappingEUVD-2016-1707 was added to the official ENISA EUVD mapping for this CVE.
    Before
    not recorded
    After
    {"euvdId":"EUVD-2016-1707"}
    ENISA EUVD ↗
  5. Catalogue recordCVE added to the BlackTree catalogue.
    CNA ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Fixed release or patch reference recorded
ENISA EUVD · EUVD-2016-1707↗Vendor CSAF · Siemens ProductCERT↗CVE authority or vendor reference↗Patch or update reference↗Patch or update reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2016-10708 · cve.blacktree.nl