BlackTreeCVE Intelligence
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Full vulnerability report · 2016
CVE-2016-1721High confidence

Affected product: Improper Restriction of Operations within the Bounds of a Memory Buffer

Unknown · Unknown

7.8HighCVSS 3.0
Recommended action
Within 7 days

High technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance.

Fix not verified
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityHighOperational priority:High, unchanged from published severity.unchanged

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • A structured source references public exploit or proof-of-concept material.
  • Exploitation requires an existing local or physical foothold with privileges.
  • EPSS is 0.99% for the current model date.

Compensating controls

  • Restrict local access and enforce least privilege on affected hosts.
  • Increase monitoring for the attack path and post-exploitation behaviour described in the report.

Verification

  1. Confirm that the asset runs Unknown Unknown and falls inside the recorded affected range.
  2. Recheck the vendor advisory before scheduling a change because no verified fixed version is currently retained.
  3. Validate exposure, authentication requirements and compensating controls in the actual environment.
  4. Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Mitigation target: Within 30 daysRemediation target: Within 180 days

This automated reassessment organises public evidence. It does not know asset exposure, business impact or control effectiveness and does not replace CVSS or a human risk decision.

Optional official sources

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

Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.

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-2016-2816

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 with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance.

Fix not verified
01

What, why and how

The kernel in Apple iOS before 9.2.1, OS X before 10.11.3, and tvOS before 9.1.1 allows local users to gain privileges or cause a denial of service (memory corruption) via unspecified vectors.

What

The kernel in Apple iOS before 9.2.1, OS X before 10.11.3, and tvOS before 9.1.1 allows local users to gain privileges or cause a denial of service (memory corruption) via unspecified vectors.

Why

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.

How

An attacker operating through local access may attempt exploitation with low privileges. If successful, the issue may disrupt the affected service.

What

The kernel in Apple iOS before 9.2.1, OS X before 10.11.3, and tvOS before 9.1.1 allows local users to gain privileges or cause a denial of service (memory corruption) via unspecified vectors.

Why

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.

How

An attacker operating through local access may attempt exploitation with low privileges. 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.
Reference recorded

A structured CVE source labels at least one public reference as exploit material. BlackTree has not independently validated that it is safe, reliable or weaponised.

Likely attack path
local access → Improper Restriction of Operations within the Bounds of a Memory Buffer → disrupt the affected service
Attack surface
Local
Privileges required
Low: a basic authenticated account is required
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-119 ↗

CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer. The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Common Vulnerability Scoring System 3.0: the compact vector below is decoded into plain language.

AVLocalAttack vector: The attacker needs local access to the vulnerable system.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRLowPrivileges required: The attacker needs basic user-level privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CHighConfidentiality impact: A successful attack can cause a major loss.IHighIntegrity impact: A successful attack can cause a major loss.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land
The issue can support a local privilege or sandbox boundary transition; normal system utilities may then be available in the gained context.
Denial of serviceCWE-119Public exploit reference
A

Official authority intelligence

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

CERT-FR · French · CERTFR-2016-AVI-106Multiples vulnérabilités dans les produits Apple

.cve.org/CVERecord?id=CVE-2015-8472 Référence CVE CVE-2015-8659 https://www.cve.org/CVERecord?id=CVE-2015-8659 Référence CVE CVE-2016-0777 https://www.cve.org/CVERecord?id=CVE-2016-0777 Référence CVE CVE-2016-0778 https://www.cve.org/CVERecord?id=CVE-2016-0778 Référence CVE CVE-2016-0801 https://www.cve.org/CVERecord?id=CVE-2016-0801 Référence CVE CVE-2016-0802 https://www.cve.org/CVERecord?id=CVE-2016-0802 Référence CVE CVE-2016-1717 https://www.cve.org/CVERecord?id=CVE-2016-1717 Référence CVE CVE-2016-1719 https://www.cve.org/CVERecord?id=CVE-2016-1719 Référence CVE CVE-2016-1720 https://www.cve.org/CVERecord?id=CVE-2016-1720 Référence CVE CVE-2016-1721 https://www.cve.org/CVERecord?id=CVE-2016-1721 Référence CVE CVE-2016-1722 https://www.cve.org/CVERecord?id=CVE-2016-1722 Référence CVE CVE-2016-1723 https://www.cve.org/CVERecord?id=CVE-2016-1723 Référence CVE CVE-2016-1724 https://www.cve.org/CVERecord?id=CVE-2016-1724 Référence CVE CVE-2016-1725 https://www.cve.org/CVERecord?id=CVE-2016-1725 Référence CVE CVE-2016-1726 https://www.cve.org/CVERecord?id=CVE-2016-1726 Référence CVE CVE-2016-1727 https://www.cve.org/CVERecord?id=CVE-2016-1727 Référence CVE CVE-2016-1732 https://www.cve.org/CVERecord?id=CVE-2016-1732 Référence CVE CVE-2016-1733 https://www.cve.org/CVERecord?id=CVE-2016-1733 Ré

Official advisory ↗
CERT-FR · French · CERTFR-2016-AVI-031Multiples vulnérabilités dans les produits Apple

De multiples vulnérabilités ont été corrigées dans les produits Apple . Elles permettent à un attaquant de provoquer une exécution de code arbitraire à distance, une exécution de code arbitraire et une atteinte à la confidentialité des données.

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2016-001404複数の Apple 製品のカーネルにおける権限を取得される脆弱性

Apple iOS、OS X、および tvOS のカーネルには、権限を取得される、またはサービス運用妨害 (メモリ破損) 状態にされる脆弱性が存在します。

Official advisory ↗
KISA KrCERT/CC · Korean · KNVD-4584Apple(iOS) 보안 업데이트 권고

#### Apple(iOS) 보안 업데이트 권고 2016.01.20 ##### □ 개요 o Apple社에서 자사 제품에 대해 다수의 취약점을 해결한 보안업데이트를 공지 o 공격자가 취약점을 이용하여 피해를 발생시킬 수 있어 해당 Apple 제품을 사용하는 이용자들은 최신버전으로 업데이트 권고 o 커널 권한으로 임의 코드 실행을 할 수 있는 등의 취약점 등 - iOS의 Disk images에서 발생하는 메모리 손상 취약점(CVE-2016-1717) - iOS의 IOHIDFamily에서 발생하는 메모리 손상 취약점(CVE-2016-1719) - iOS의 IOKit에서 발생하는 메모리 손상 취약점(CVE-2016-1720) - iOS의 Kernel에서 발생하는 메모리 손상 취약점(CVE-2016-1721) - iOS의 libxslt에서 발생하는 타입 컨퓨젼 취약점(CVE-2015-7995) - iOS의 syslog에서 발생하는 메모리 손상 취약점(CVE-2016-1722) - iOS의 Webkit에서 발생되는 다중 메모리 손상 취약점(CVE-2016-1723~1727) - iOS의 Webkit CSS에서 발생하는 정보유출 취약점(CVE-2016-1728) - iOS의 WebSheet에서 발생하는 정보유출 취약점(CVE-2016-1730) ##### □ 해당 시스템 o iOS - iOS 9.2.1 미만 버전[1] ##### □ 해결 방안 o iOS 사용자 - 최신 9.2.1 버전으로 업데이트 - [설정]→[일반]→[소프트웨어업데이트] 선택→[다운로드 및 설치]→[동의] 선택하여 업데이트 ##### □ 기타 문의사항 o 한국인터넷진흥원 인터넷침해대응센터: 국번없이 118 [참고사이트] [1] https://support.apple.com/en-us/HT205732

Official advisory ↗
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.
Fix not verified
Affected
n/a
Fixed
No fixed version is explicitly recorded in the structured CVE data.
Action
No verified patch reference is present in the current structured sources. Check the vendor advisory before making a change.
Workaround
No verified workaround is recorded. Limit untrusted access and use least privilege until authoritative guidance is available.
04

Evidence and provenance

Published 1 Feb 2016 · Last source change 5 Aug 2024, 23:02 UTC · CWE-119 · Improper Restriction of Operations within the Bounds of a Memory Buffer

CVE recordCVE.org · 5.1
CVSS sourceNIST NVD
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-2016-2816
Product sourceUnavailable
Remediation sourceCVE/CNA references
CWE sourceNIST NVD
NVD statusNVD modified after enrichment

Missing structured fields: affected product. Missing data is not evidence of low risk; review the primary advisory.

Material change intelligence

What changed after publication

View recent updates ↗
  1. ENISA EUVD mappingEUVD-2016-2816 was added to the official ENISA EUVD mapping for this CVE.
    Before
    not recorded
    After
    {"euvdId":"EUVD-2016-2816"}
    ENISA EUVD ↗
  2. Vendor guidanceAuthoritative vendor guidance changed: added vendor advisory: support.apple.com/HT205729; added vendor advisory: support.apple.com/HT205731; 2 further additions.
    Before
    vendor advisory: lists.apple.com/msg00001.html · vendor advisory: lists.apple.com/msg00002.html · vendor advisory: lists.apple.com/msg00003.html · 1 more references
    After
    vendor advisory: lists.apple.com/msg00001.html · vendor advisory: lists.apple.com/msg00002.html · vendor advisory: lists.apple.com/msg00003.html · 5 more references
    support.apple.com ↗
  3. SeveritySeverity changed from Unknown to High.
    Before
    Unknown
    After
    High
    NIST NVD ↗
  4. CVSS scoreCVSS score changed from not recorded to 7.8 (CVSS 3.0 · NIST NVD · CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).
    Before
    not recorded
    After
    7.8 (CVSS 3.0 · NIST NVD · CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
    NIST NVD ↗
  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
ENISA EUVD · EUVD-2016-2816↗CVE authority or vendor reference↗Vendor advisory↗Vendor advisory↗Vendor advisory↗Public exploit reference↗Public exploit 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-2016-1721 · cve.blacktree.nl