CISA KEV High Memory corruption

CVE-2009-1862 — Adobe Acrobat and Reader, Flash Player Unspecified Vulnerability

Unspecified vulnerability in Adobe Reader and Acrobat 9.x through 9.1.2, and Adobe Flash Player 9.x through 9.0.159.0 and 10.x through 10.0.22.87, allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via (1) a crafted Flash application in a .pdf file or (2) a crafted .swf file, related to authplay.dll, as exploited in the wild in July 2009.

Published Jul 23, 2009 · Updated Oct 13, 2026 · Sources: CISA Known Exploited Vulnerabilities, CVE Program (cve.org) e CISA ADP, NIST National Vulnerability Database, GitHub Security Advisories · CNA: mitre

High

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

CISA KEV · Jun 8, 2022

How the score was calculated

Confirmed exploitation (CISA KEV)+35
EPSS 21.2% (30-day exploitation probability)+15
Technical severity (high)+6

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Confirmed

CISA KEV, listed Jun 8, 2022

EPSS FIRST

21.2%

ahead of 98% of scored CVEs · Oct 14, 2026

Affects

Adobe

Acrobat and 2 more

CVSS base

7.8

High · 4 source(s)

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Exploitation

Active

none · proof-of-concept · active

Automatable

can an attacker script the kill-chain steps

Technical impact

Total

partial · total control of the vulnerable component

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

CISA required action CISA

For Adobe Acrobat and Reader, apply updates per vendor instructions. For Adobe Flash Player, the impacted product is end-of-life and should be disconnected if still in use.

US federal deadline: Jun 22, 2022 — passed 1576 day(s) ago

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Adobe Acrobat, Adobe Acrobat Reader, Adobe Flash Player).
Treat as emergency remediation: the CVE is in CISA KEV (confirmed exploitation).
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Exploitation requires user interaction: tighten email/web filtering and warn affected users.
EPSS ahead of 98% of scored CVEs: prioritize it in the patch queue.
Search available logs for exploit probes matching the vulnerability class (memory corruption), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Adobe	Acrobat	≥ 9.0 and ≤ 9.1.2	Vulnerable	NIST National Vulnerability Database
Adobe	Acrobat Reader	≥ 9.0 and ≤ 9.1.2	Vulnerable	NIST National Vulnerability Database
Adobe	Flash Player	≥ 9.0 and ≤ 9.0.159.0≥ 10.0 and ≤ 10.0.22.87	Vulnerable	NIST National Vulnerability Database

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector

Local

Attack complexity

Low

Privileges required

None

User interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Score	Version	Severity	Expl.	Impact	Scored by
7.8	CVSS 3.1	High	1.8	5.9	nvd@nist.gov via NIST National Vulnerability Database
7.8	CVSS 3.1	High	1.8	5.9	134c704f-9b21-4f2e-91b3-4a467353bcc0 via NIST National Vulnerability Database
7.8	CVSS 3.1	High	—	—	GitHub, Inc. via GitHub Security Advisories
7.8	CVSS 3.1	High	—	—	CISA-ADP via CVE Program (cve.org) e CISA ADP
9.3	CVSS 2.0	High	8.6	10.0	nvd@nist.gov via NIST National Vulnerability Database

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H (score shown at the top: nvd@nist.gov)

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-787 · Out-of-bounds Write

Other CVEs with this weakness →

CISA KEV details CISA

CISA lists a CVE once it has evidence of exploitation against real targets.

Listed

Jun 8, 2022

Federal deadline

Jun 22, 2022

passed 1576 day(s) ago

Ransomware use

Unknown

CISA records ransomware use only for campaigns it has confirmed, so “Unknown” means unrecorded, not ruled out. The deadline binds US federal agencies; for everyone else it is a reference date.

EPSS over time FIRST

Oct 13, 2026 → Oct 14, 2026 · 2 reading(s) · max 21.20%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Local/physical vector: focus on endpoint telemetry (EDR) from affected hosts.
Correlate service crashes/restarts with inbound traffic; repeated crashes may indicate attempts.
Hunt retroactively in logs from before Jun 8, 2022 (KEV listing): exploitation may have started earlier.

endpoint telemetry (EDR)crash dumps

Timeline

What happened to this CVE, newest first.

2026
Affected products added · adobe/acrobat, adobe/acrobat reader, adobe/flash player
Oct 13, 2026 · NIST National Vulnerability Database
Source status changed · Published → Analyzed
Oct 13, 2026 · NIST National Vulnerability Database
Record published
Oct 13, 2026
CVSS changed · 7.8
Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
Source status changed · → Published
Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
SSVC assessment updated
Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
Added to CISA KEV (detected)
Oct 13, 2026 · CISA Known Exploited Vulnerabilities
Record created in this database
Oct 13, 2026 · CISA Known Exploited Vulnerabilities
2022
Added to CISA KEV catalog
Jun 7, 2022 · CISA
2009
CVE published
Jul 23, 2009 · mitre

Source activity

Repeated readings are counted rather than listed.

3× References added · Oct 13, 2026 – Oct 13, 2026
1× Official description updated · Oct 13, 2026 – Oct 13, 2026

References

23 on the record

blogs.adobe.com/psirt/2009/07/potential_adobe_reader_and_fla.html
x_refsource_MISC, Broken Link, Vendor Advisory, CVE Program (cve.org) e CISA ADP
www.adobe.com/support/security/advisories/apsa09-03.html
x_refsource_CONFIRM, Vendor Advisory, CVE Program (cve.org) e CISA ADP
www.cisa.gov/known-exploited-vulnerabilities-catalog
US Government Resource, NIST National Vulnerability Database
security.gentoo.org/glsa/glsa-200908-04.xml
vendor-advisory, x_refsource_GENTOO, Third Party Advisory, CVE Program (cve.org) e CISA ADP
bugs.adobe.com/jira/browse/FP-1265
x_refsource_MISC, Broken Link, CVE Program (cve.org) e CISA ADP
www.symantec.com/business/security_response/writeup.jsp
x_refsource_MISC, Broken Link, CVE Program (cve.org) e CISA ADP
lists.apple.com/archives/security-announce/2009/Sep/msg00004.html
vendor-advisory, x_refsource_APPLE, Mailing List, Third Party Advisory, CVE Program (cve.org) e CISA ADP
www.symantec.com/connect/blogs/next-generation-flash-vulnerability
x_refsource_MISC, Broken Link, CVE Program (cve.org) e CISA ADP
secunia.com/advisories/36193
third-party-advisory, x_refsource_SECUNIA, Broken Link, CVE Program (cve.org) e CISA ADP
www.kb.cert.org/vuls/id/259425
third-party-advisory, x_refsource_CERT-VN, Third Party Advisory, US Government Resource, CVE Program (cve.org) e CISA ADP
secunia.com/advisories/36374
third-party-advisory, x_refsource_SECUNIA, Broken Link, CVE Program (cve.org) e CISA ADP
www.adobe.com/support/security/bulletins/apsb09-13.html
x_refsource_CONFIRM, Not Applicable, CVE Program (cve.org) e CISA ADP
sunsolve.sun.com/search/document.do
vendor-advisory, x_refsource_SUNALERT, Broken Link, CVE Program (cve.org) e CISA ADP
isc.sans.org/diary.html
x_refsource_MISC, Not Applicable, CVE Program (cve.org) e CISA ADP
support.apple.com/kb/HT3864
x_refsource_CONFIRM, Third Party Advisory, CVE Program (cve.org) e CISA ADP
secunia.com/advisories/36701
third-party-advisory, x_refsource_SECUNIA, Broken Link, CVE Program (cve.org) e CISA ADP
lists.apple.com/archives/security-announce/2009/Sep/msg00003.html
vendor-advisory, x_refsource_APPLE, Mailing List, Third Party Advisory, CVE Program (cve.org) e CISA ADP
github.com/advisories/GHSA-wx6p-35hf-vhhj
GitHub Security Advisories
support.apple.com/kb/HT3865
x_refsource_CONFIRM, Third Party Advisory, CVE Program (cve.org) e CISA ADP
www.adobe.com/support/security/bulletins/apsb09-10.html
x_refsource_CONFIRM, Not Applicable, CVE Program (cve.org) e CISA ADP
nvd.nist.gov/vuln/detail/CVE-2009-1862
GitHub Security Advisories
www.securityfocus.com/bid/35759
vdb-entry, x_refsource_BID, Broken Link, Third Party Advisory, VDB Entry, CVE Program (cve.org) e CISA ADP
news.cnet.com/8301-27080_3-10293389-245.html
x_refsource_MISC, Broken Link, CVE Program (cve.org) e CISA ADP

Elsewhere on this site

Adobe
every CVE for this vendor

2022-06
what else CISA listed that month

Memory corruption
same class

CWE-787
other pages naming this weakness

Related CVEs (same products)

Medium CVE-2026-82001 Uncontrolled Resource Consumption in Adobe Acrobat Sep 8, 2026
Medium CVE-2026-81993 Heap-based Buffer Overflow in Adobe Acrobat Sep 8, 2026
Medium CVE-2026-81994 Prototype Pollution in Adobe Acrobat Sep 8, 2026
Medium CVE-2026-81997 Incorrect Authorization in Adobe Acrobat Sep 8, 2026
High CVE-2026-81996 Incorrect Authorization in Adobe Acrobat Sep 8, 2026
High CVE-2026-81988 Use After Free in Adobe Acrobat Sep 8, 2026

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No fixed version, patch or mitigation documented.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2009-1862 is "Adobe Acrobat and Reader, Flash Player Unspecified Vulnerability", rated High. It affects Acrobat (Adobe); versions are in the scope table. It is in CISA KEV: there is evidence of real-world exploitation. CVSS 7.8 describes technical severity. EPSS 21.20% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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