CVE-2012-0840

mediumpriority · attend · 45EPSS 0.421 · 99 %ileexploit · functionalEUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

1 exploit · functional

Likely / severe?

42.1% (99th) EPSS

CVSS 5 · medium

Is it mine?

36 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · nvd

EPSS · scored 2026-10-27

tables/apr_hash.c in the Apache Portable Runtime (APR) library through 1.4.5 computes hash values without restricting the ability to trigger hash collisions predictably, which allows context-dependent attackers to cause a denial of service (CPU consumption) via crafted input to an application that maintains a hash table.

cvss

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

5.0

010

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

v2.05mediumAV:N/AC:L/Au:N/C:N/I:N/A:Pprimary · NVD / NIST USexploitability 10 · impact 2.9

v2.05mediumAV:N/AC:L/Au:N/C:N/I:N/A:P/E:Hsecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-20USprimary

exploits (1)

Public proof-of-concept and weaponised exploit code.

EDB-36669Apache APR - Hash Collision Denial of Servicefunctional · exploit_db

affected products (36)

Products and version ranges known to be affected.

n/a n/a≤ n/aenisa_euvdEU
apache portable runtime≤ 1.4.5nvdUScpe:2.3:a:apache:portable_runtime:*:*:*:*:*:*:*:*
apache portable runtime= 0.9.1nvdUScpe:2.3:a:apache:portable_runtime:*:*:*:*:*:*:*:*
apache portable runtime= 0.9.16-devnvdUScpe:2.3:a:apache:portable_runtime:*:*:*:*:*:*:*:*
apache portable runtime= 0.9.2nvdUScpe:2.3:a:apache:portable_runtime:*:*:*:*:*:*:*:*
apache portable runtime= 0.9.2-devnvdUScpe:2.3:a:apache:portable_runtime:*:*:*:*:*:*:*:*
apache portable runtime= 0.9.3nvdUScpe:2.3:a:apache:portable_runtime:*:*:*:*:*:*:*:*
apache portable runtime= 0.9.3-devnvdUScpe:2.3:a:apache:portable_runtime:*:*:*:*:*:*:*:*
apache portable runtime= 0.9.4nvdUScpe:2.3:a:apache:portable_runtime:*:*:*:*:*:*:*:*
apache portable runtime= 0.9.5nvdUScpe:2.3:a:apache:portable_runtime:*:*:*:*:*:*:*:*
apache portable runtime= 0.9.6nvdUScpe:2.3:a:apache:portable_runtime:*:*:*:*:*:*:*:*
apache portable runtime= 0.9.7nvdUScpe:2.3:a:apache:portable_runtime:*:*:*:*:*:*:*:*
apache portable runtime= 0.9.7-devnvdUScpe:2.3:a:apache:portable_runtime:*:*:*:*:*:*:*:*
apache portable runtime= 0.9.8nvdUScpe:2.3:a:apache:portable_runtime:*:*:*:*:*:*:*:*
apache portable runtime= 0.9.9nvdUScpe:2.3:a:apache:portable_runtime:*:*:*:*:*:*:*:*
apache portable runtime= 1.3.0nvdUScpe:2.3:a:apache:portable_runtime:*:*:*:*:*:*:*:*
apache portable runtime= 1.3.1nvdUScpe:2.3:a:apache:portable_runtime:*:*:*:*:*:*:*:*
apache portable runtime= 1.3.10nvdUScpe:2.3:a:apache:portable_runtime:*:*:*:*:*:*:*:*
apache portable runtime= 1.3.11nvdUScpe:2.3:a:apache:portable_runtime:*:*:*:*:*:*:*:*
apache portable runtime= 1.3.12nvdUScpe:2.3:a:apache:portable_runtime:*:*:*:*:*:*:*:*

showing 20 of 36

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 2012-02-10modified 2026-06-16

related (25,198)

Related entries.

ID	severity	EPSS	exploitable	published
CVE-2026-88771US	critical9.8OT critical	82.2% (100th)	KEV	2026-09-27
Improper input validation vulnerability in Citrix NetScaler ADC and Citrix NetScaler Gateway. This issue affects ADC: before 14.1-73.37, before 13.1-64.23, before 14.1-73.37 FIPS,…
CVE-2026-93952US	—OT critical	1.38% (72nd)	KEV	2026-09-22
VeloCloud Orchestrator (VCO) on-prem has a security issue where this issue may allow a remote attacker to access privileged internal functionality and impact the VCO host. Successf…
CVE-2026-12569US	critical9.8OT critical	46.0% (99th)	KEV	2026-06-18
A critical remote code execution (RCE) vulnerability has been reported in PTC Windchill PDMlink and PTC FlexPLM. The vulnerability may be exploited through the deserialization of u…
CVE-2026-34910US	—OT critical	90.0% (100th)	KEV	2026-05-22
A malicious actor with access to the network could exploit an Improper Input Validation vulnerability found in UniFi OS devices to execute a Command Injection.
CVE-2026-6973US	—OT critical	34.5% (98th)	KEV	2026-05-07
An Improper Input Validation in Ivanti EPMM before versions 12.6.1.1, 12.7.0.1, and 12.8.0.1 allows a remotely authenticated user with administrative access to achieve remote code…

+25193 more

references (29)

External citations — patches, advisories, analysis.

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.

Free scan