CVE-2023-33987 [High] | Security Vulnerability in Web Dispatcher

An unauthenticated attacker in SAP Web Dispatcher - versions WEBDISP 7.49, WEBDISP 7.53, WEBDISP 7.54, WEBDISP 7.77, WEBDISP 7.81, WEBDISP 7.85, WEBDISP 7.88, WEBDISP 7.89, WEBDISP 7.90, KERNEL 7.49, KERNEL 7.53, KERNEL 7.54 KERNEL 7.77, KERNEL 7.81, KERNEL 7.85, KERNEL 7.88, KERNEL 7.89, KERNEL 7.90, KRNL64NUC 7.49, KRNL64UC 7.49, KRNL64UC 7.53, HDB 2.00, XS_ADVANCED_RUNTIME 1.00, SAP_EXTENDED_APP_SERVICES 1, can submit a malicious crafted request over a network to a front-end server which may, over several attempts, result in a back-end server confusing the boundaries of malicious and legitimate messages. This can result in the back-end server executing a malicious payload which can be used to read or modify information on the server or make it temporarily unavailable.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-07-12	0.58%	0.69%	+0.11%
2	2026-06-15	0.18%	0.58%	+0.40%
3	2026-04-05	—	0.18%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-07-12

0.58%

0.69%

+0.11%

2026-06-15

0.18%

0.58%

+0.40%

2026-04-05

—

0.18%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
8.6	3.1	HIGH	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H` 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:C) Breaking this can reach past the original component and bite other resources—bigger blast radius. Confidentiality (C:N) Doesn’t really leak secrets in a meaningful way. Integrity (I:N) Data isn’t meaningfully altered or forged. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	3.9	4.0	[email protected]
9.4	3.1	CRITICAL	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L` 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:H) They could widely tamper with or forge data—trust in the data is badly hurt. Availability (A:L) Might cause slowdowns, glitches, or partial disruption—not a full brick.	3.9	5.5	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

8.6

3.1

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H 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:C): Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:N): Doesn’t really leak secrets in a meaningful way.
Integrity (I:N): Data isn’t meaningfully altered or forged.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

3.9

4.0

[email protected]

9.4

3.1

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L 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:H): They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:L): Might cause slowdowns, glitches, or partial disruption—not a full brick.

3.9

5.5

[email protected]

Affected software / configurations for CVE-2023-33987

Vendor	Product	Version	Raw CPE
sap	web_dispatcher	7.49	cpe:2.3:a:sap:web_dispatcher:7.49:::::::*
sap	web_dispatcher	7.53	cpe:2.3:a:sap:web_dispatcher:7.53:::::::*
sap	web_dispatcher	7.54	cpe:2.3:a:sap:web_dispatcher:7.54:::::::*
sap	web_dispatcher	7.77	cpe:2.3:a:sap:web_dispatcher:7.77:::::::*
sap	web_dispatcher	7.81	cpe:2.3:a:sap:web_dispatcher:7.81:::::::*
sap	web_dispatcher	7.85	cpe:2.3:a:sap:web_dispatcher:7.85:::::::*
sap	web_dispatcher	7.88	cpe:2.3:a:sap:web_dispatcher:7.88:::::::*
sap	web_dispatcher	7.89	cpe:2.3:a:sap:web_dispatcher:7.89:::::::*
sap	web_dispatcher	7.90	cpe:2.3:a:sap:web_dispatcher:7.90:::::::*
sap	web_dispatcher	hdb_2.00	cpe:2.3:a:sap:web_dispatcher:hdb_2.00:::::::*
sap	web_dispatcher	kernel_7.49	cpe:2.3:a:sap:web_dispatcher:kernel_7.49:::::::*
sap	web_dispatcher	kernel_7.53	cpe:2.3:a:sap:web_dispatcher:kernel_7.53:::::::*
sap	web_dispatcher	kernel_7.54	cpe:2.3:a:sap:web_dispatcher:kernel_7.54:::::::*
sap	web_dispatcher	kernel_7.77	cpe:2.3:a:sap:web_dispatcher:kernel_7.77:::::::*
sap	web_dispatcher	kernel_7.81	cpe:2.3:a:sap:web_dispatcher:kernel_7.81:::::::*
sap	web_dispatcher	kernel_7.85	cpe:2.3:a:sap:web_dispatcher:kernel_7.85:::::::*
sap	web_dispatcher	kernel_7.88	cpe:2.3:a:sap:web_dispatcher:kernel_7.88:::::::*
sap	web_dispatcher	kernel_7.89	cpe:2.3:a:sap:web_dispatcher:kernel_7.89:::::::*
sap	web_dispatcher	kernel_7.90	cpe:2.3:a:sap:web_dispatcher:kernel_7.90:::::::*
sap	web_dispatcher	krnl64nuc_7.49	cpe:2.3:a:sap:web_dispatcher:krnl64nuc_7.49:::::::*
sap	web_dispatcher	krnl64uc_7.49	cpe:2.3:a:sap:web_dispatcher:krnl64uc_7.49:::::::*
sap	web_dispatcher	krnl64uc_7.53	cpe:2.3:a:sap:web_dispatcher:krnl64uc_7.53:::::::*
sap	web_dispatcher	sap_extended_app_services_1	cpe:2.3:a:sap:web_dispatcher:sap_extended_app_services_1:::::::*
sap	web_dispatcher	xs_advanced_runtime_1.00	cpe:2.3:a:sap:web_dispatcher:xs_advanced_runtime_1.00:::::::*

References for CVE-2023-33987

URL	Tags
https://me.sap.com/notes/3233899	Permissions Required
https://www.sap.com/documents/2022/02/fa865ea4-167e-0010-bca6-c68f7e60039b.html	Vendor Advisory

URL

CVE-2023-33987 | Request smuggling and request concatenation in SAP Web Dispatcher

Exploit prediction scoring system (EPSS) score for CVE-2023-33987

Common vulnerability scoring system (CVSS) metrics for CVE-2023-33987

Weakness enumeration for CVE-2023-33987

Affected software / configurations for CVE-2023-33987

References for CVE-2023-33987